Another thing that just occurred to me: #Bluesky started off as a project exploring the possibility of transporting #Twitter onto a protocol that allows for account portability. I've been thinking of that mostly in terms of data capture — the network is designed to make users trackable no matter which server they call home. But if the plan is still to transplant Twitter onto the AT protocol, then eventually the entire population of Twitter will merge into the Bluesky network.
There was a recent tempest in a teacup over a nazi getting into the #Bluesky beta. The devteam was quick to kick him right back out again, and everyone went back to doing whatever it is they do in there, content that they had learned the proper lesson from the "nazi bar" anecdote. But what happens is Elon flips a switch, and suddenly the entire population of #Twitter is on the Bluesky network? How does the population there deal with an instant influx of tens of thousands of hard right wingers?