In what way? You don’t own anything on the fediverse. The people who run the various instances do.

Maybe they even have a TOS that says you own it, but then what? its still up to them to continue to host it, and they have no contract with you.

Unless you are self hosting your own instance, and only count what is on that, you own no more than with larger social media sites.

To be clear, I think that federations certainly are better than monolithic sources for a variety of reasons for real people, but they aren’t a solution for ownership.