This is actually a great question, in the context of the Fediverse.
Usually, every social network or forum has in their ELUA that anything you post is theirs, and you can’t do anything about i.e Reddit using your data to train AIs.
Hlwever, here, we’re on private instances of regular people. We can make our own rules, can’t we? If an instance would say that anything you post is copyrighted by the author, i.e by CC, would it be enforcable if someone would decide to scrape (or repost) the content for profit?
Looks like I’ll finally get a reason to cut off another website I hate using, but never found the willpower to get rid off.
Good