That's not the point (edit): the only thing I'm missing from libera is an impressum. Mentioning a nameless swedish nonprofit is actually worse in my eyes, than calling it xyz's server in the basement.

That is the point. People don't use Facebook because they like using real names, people use real names on Facebook because they were forced to in order to stay on Facebook.

When that Zuck quote happened, Facebook didn't require real names.

It actually doesn't. It requires your name look like a true name. I know plenty of folks with fake last names on Facebook.

My understanding is it requires true names and is unevenly enforced.

If it's unevenly enforced, then it's not "required" in any practical sense. Nobody I know has ever been kicked off for a fake but reasonable looking name. Facebook is not a government authority. If you ask for a picture of my ID, I can generate a fake one without consequence.

It's unevenly enforced, not unenforced. If you're willing to photoshop yourself an ID, then sure, that probably works.

FBI can fetch the true names thus nicknames became irrelevant