@grumpasaurus @molly0xfff @thomasfuchs So I remembered on Twitter back in the day the claim that federating with another server means that users on both servers technically had access to each other's DMs, and while I'm not 100% of the validity of that, it could be that their user profile information is shared with another entity.
And had they wanted Bluesky to have it, they would've...made an account there.
And vice versa for Bluesky accounts not making a Mastodon account.