[suprjami]

People said the same thing when Tumblr added ActivityPub.

The most likely situation is that the fediverse would spot this tactic and mass de-federate anyone who tried it, so that bad actor would be left making their own island and any investment in federation would be lost.

It doesn't make business sense to try and EEE the fediverse.

[jamilton]

Tumblr hasn't added ActivityPub support yet.

I think more likely is that few people would really migrate in the first place. What killer feature would do such a thing? People just make accounts where their friends and interests are. I guess Facebook might promote it heavily and network effects will get new people on it, but this wouldn't really affect other instances, I think.