You can introduce interoperability. I am on X. I can’t go to Bluesky. Let’s say that Elon Musk decides to block me because I said something he didn’t like. He has blocked me before for a couple of weeks. Now, I have more than a million followers on X. I cannot leave without losing them. If I go to Bluesky, I have 10 followers. Interoperability would mean that if I go to another platform, to Bluesky, when I post something on Bluesky, then my 1 million followers on X can hear it.

Sounds like Fediverse’s ActivityPub