I mean, look at Tumblr and Threads supporting ActivityPub. (Or at least pledging to.) The big corpos are trying their best to enshittify the fediverse. It's so vital that Lemmy instance operators commit to refusing to federate with things like that.

I do think the Fediverse also could stand to have more options for migrating both user accounts and things like communities between instances. I suppose communities can be migrated just by locking the community and leaving a pinned comment saying "we're moving to such-and-such instance ". User accounts can also be done in similar ways. I myself migrated when latte.isnot.coffee disappeared. I didn't really leave any message anywhere saying I was switching instances or anything. (By the time I migrated, latte.isnot.coffee was completely inaccessible. I couldn't change my old account's bio to say I'd moved if I wanted to.)

But maybe some measures to streamline some of that would be nice. In ways that don't lose the history of the user/community.

Edit: Another idea that occurrs to me. I'd imagine it'd be doable to create ActivityPub "proxies". Programs that implement the ActivityPub protocol and forward requets on to an actual Lemmy instance or whatever. But which have extra logic that blocks posts based on content. Maybe anything that has the word "sponsored" in the title or something. And then you could federate with Threads, but block certain content. Not a perfect solution, but could be a decent way to get more content on the Fediverse and maybe expose normies on Threas and Tumblr to the idea of the Fediverse while blocking BS.