Proprietary flatpacks, containers, etc since Silverblue isn’t a real
distribution, but really a collection of tools to pull in other stuff.
That’s a gross mis-characterization of the project. It is fully backed by the Fedora council, uses the same RPMs as found in Fedora, does not ship any proprietary software, and is subject to the same guidelines as any other Fedora project.
The statement “…really a collection of tools to pull in other stuff” could be applied to any distribution available; rpm, apt, emerge are all tools that are used to “pull in other stuff”.
Just because you are able to use Flatpaks or containers to install/run proprietary software on the host is not an indictment of the entire process. You are able to do the same with yum or dnf; just find a repo where someone maintains the proprietary software and go get it.
It’s ultimately the choice of the person using any distribution. Silverblue does not encourage, promote, or require users to download and use proprietary software. This kind of FUD does nothing to help grow the project or community and appears to only poison the well.