I’m actually excited about Threads because it supposedly uses ActivityPub. I know all my non-techie friends are going to use it and I should be able to participate from my self-hosted Mastodon instance.
If on your server you have one set of privacy rights that your users agree to, but then if their posts are Federated over to Meta, that has their set of privacy rights that is less encompassing/ protecting and not agreed to by your users, what does that mean legally?
I'm sorry to break it to you but from what I've read their federation will be based on whitelists and only federate with very large mastodon instances.