Who is “they”? The users, or the communities? Beehaw creates the communities, that’s why there are relatively few, so I don’t see that Beehaw communities would have much reason to move anyway. Beehaw has no create community button.

Currently kbin is the only one I am aware of.

I doubt they will. They already added a 10 minute limit in airdrop for the “receive from everyone” setting (China first, now worldwide). From a security perspective it’s a good change but it does block the usefulness of airdrop as a tool for mass messaging.