@plasma4045 @jdp23 it is gigantically unclear if federated public content is "owned" by anyone. Unlike the centrlized commercial apps, who do claim ownership of all posts on them. So legal protections are shall we say untested. I don't own the posts done by users on indieweb.social for example.
Plus anything public over the web is scrapable. End of story, fetchable or not via ActivityPub. That leaves the 1 percent of DM's or non-public messages, but 99 percent is out there.