From a personal perspective, I’m kind of leaning towards fedora.im as identity domain (i.e. @puiterwijk:fedora.im).
Otherwise people can easily have a @username:fedoraproject.org Matrix identity without having a username@fedoraproject.org email address, since we only give the email alias to CLA+1, and I am guessing we want the Matrix server for everyone with a FAS account (do we?) to involve to-be-contributors in communications.
I think that that could be somewhat confusing.
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Patrick, yes, that’s an excellent point with CLA+1 and email accounts.
So let’s consider this decided. 
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I like fedora.im too
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+1 for fedora.im, provided the domain is already controlled by Fedora Infrastructure / Red Hat.
It is worth noting Fedora contributors already have a @fedoraproject.org mailing address alias with their FAS usernames. If a contributor wished to use the fedoraproject.org domain to represent themselves, they could still do so (and have). I like fedora.im for Matrix because it is short, succinct, and easy to type.
It is subtle, but a short domain is best because it will be typed frequently, as many Matrix users know. 
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I kind of prefer to fedora.im.
- It seems less formal, which may be a good thing if people are going to use it for informal not-Fedora related things where
fedoraproject.orgmight feel awkward. I think this is more important due to Matrix clients mostly not supporting multiple accounts. - It’s shorter. It probably has no effect on Matrix itself, but it may mean (a bit less) traffic to bridged protocols like IRC where the username is generally shown in real name (gecos) and it can be cut with particularly long account names. The real name may matter in case of channel access or bans which in case of freenode has extban
$rfor bans and quiets (I thought also invites, but the/quote help extbanintegrated documentation of freenode disagrees. - Anyone using it can add
#whatever:domain.tldaliases for rooms and any room moderator can publish those. That may result into nasty addresses involving Fedora Project circulating around. I originally had some other reason here, but it slipped my mind and I was only able to think this in addition to the two above ones.
I also saw a question on Fedora Diversity brought up on whether Matrix accounts will be renameable once FAS/Noggin supports that, but that may be a topic for different thread.
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I’m +1 to fedoraproject.org. I don’t use and don’t see why to use fp.o outside the project. fedora.im sounds more like a chat client or something like that
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+1 for fedoraproject.org
It feels more official and has a more obvious affiliation to the project it is for. Not that fedora.im is bad, but I could see that causing more of the already common misunderstanding around a specific headwear 
And this ^
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What about fedora.chat? Like rocket.chat.
But, fedora.im is less formal and shorter.
+1 fedora.im
For the reasons pointed by puiterwijk.
I’d personally prefer fedoraproject.org. The symmetry with email addresses makes it easy for me to remember and the rest of the larger community understands fedoraproject.org as someone from the Fedora community. We’ve been doing it for a long time with the email address. Additionally, I actually expected that we’d gate an account on the server on CLA+1 like we do getting the email alias.
Note that you wouldn’t need a Fedora homeserver login to access Fedora Matrix rooms anyway.
I kind of wish we could have both though. I get the benefits of fedora.im and it’s certainly trendy and cool!
Is there a way where we could issue either one or both?
And also note that whatever the primary domain for the Matrix server is set to, that’s what all the Matrix rooms would use too. I want #kde:fedoraproject.org, not #kde:fedora.im.
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The fedora.im domain has already been taken
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Right — we own fedora.im
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+1 on fedora.im domain
Its simple, shorter and it’s more directed to the intuite of usage.
I like Neal’s idea of having both, with fedoraproject.org name ruled by the same policy as the fedoraproject mail alias, while fedora.im being relaxed version.
It would feel much more natural for me to use a “traditional” handle.
But if it is hard to implement now, then Patrick’s point on not requiring the Contributor agreement for fedora.im wins the argument for me.
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I think it is already possible for people to have links/tags that show fedoraproject.org after their FAS account without CLA+1. It is probably a fluke, but I don’t think I have the “+1” and yet the link on my Fedora Magazine comments has always showed https://glb.id.fedoraproject.org/. That might be because I misconfigured something when I created the WordPress account, but nevertheless, I think it has always been possible to have such “ids” without CLA+1. So maybe that isn’t too serious of a concern?
Here is a link to an example comment on Fedora Magazine with my name connected to https://glb.id.fedoraproject.org/:
(Update: I asked an in #element-web and it doesn’t seem like my concern was warranted). Using a different subdomain is apparently fine.
Element themselves recommend using a different domain for the homeserver and for Element. Using a different subdomain (chat.fedoraproject.org and fedoraproject.org) wouldn’t solve this issue as it’s still the same domain.
It isn’t necessarily a big risk, but using a different domain completely eliminates that attack vector. It’s probably best to be extra cautious. So my vote is for fedora.im.
We do not recommend running Element from the same domain name as your Matrix homeserver. The reason is the risk of XSS (cross-site-scripting) vulnerabilities that could occur if someone caused Element to load and render malicious user generated content from a Matrix API which then had trusted access to Element (or other apps) due to sharing the same domain.
We have put some coarse mitigations into place to try to protect against this situation, but it’s still not good practice to do it in the first place. See GitHub issue for more details.
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Server on fedoraproject.org, self-hosted Element Web on fedora.im.
Accounts @username:fedoraproject.org looks better and more official, IMO.
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To clarify:
http://username.id.fedoraproject.org → your openid identity. Everyone with a account can have one.
username@fedoraproject.org alias → an email alias that forwards to your email in account system. Only folks with fpca+1 group have these.
OpenID identities are slowly going away. Only a few things use them in our infra anymore (magazine, pagure, bodhi, badges).
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fedora.im
TLD for the Isle of Man? This is really better than buying fedora.chat?