First, I think I’m wrong, but does the Fedora Project provide an email to use for contributors? Are there fedoraproject.org domains out there?
Second, to Proton Mail users, have you run into any problems using that email provider to log in and participate in Fedora Project tools and platforms? I don’t expect there to be problems, but from what I follow in the r/ProtonMail subreddit I see weird problems come up that I wouldn’t expect.