Meta just announced that they are trying to integrate Threads with ActivityPub (Mastodon, Lemmy, etc.). We need to defederate them if we want to avoid them pushing their crap into fediverse.
If you’re a server admin, please defederate Meta’s domain “threads.net”
If you don’t run your own server, please ask your server admin to defederate “threads.net”.
Someone actually asked an almost identical question on StackEx a while ago. (things may have changed since) From what I got from skimming the answer, is there is precedence, and it should be covered within the TOS of the hosting website/network (i.e. lemmy.world)
https://law.stackexchange.com/questions/7773/does-a-tos-also-apply-for-third-party-resources-on-a-website