It’s a scam.

They have 2^32 “planets” (a UUID that you can use to interact with the Urbit network), that they are each trying to sell for ~$10-$20 on a cute “exchange”: https://urbit.live/

(Of course you don’t really own anything when buying a planet because someone else owns the “star” and the “galaxy” and you can’t buy those unless you’re friends with them)

They even have a nice pyramid diagram for their not-pyramid-scheme:

https://media.urbit.org/site/posts/essays/value-of-address-s...