As an active user (completely unaffiliated with Tlon), I can say that communities are truly booming on Urbit right now. Their newly released OS1 is pleasant to use and quite functional. The discourse in the many notebooks and chats I'm a part of is lively and engaging. If you're curious, boot[1] a comet[2] and message me at ~wolref-podlex—I'd be happy to set you up with a planet.
Urbit has been popping up here and there for quite a few years now -- can someone explain what it is in terms simple to understand?
More than anything Urbit is impossible to comprehend. All I understood from it is that it's some bizarre distributed something with an alt right attachment.