Don’t have a solution to your problem, but I think in all cases federation should be opt-in
This is why the forums don’t syndicate to Mastodon
- By : Matthew Brown
- Category : spam
- Tags: ActivityPub, fedi, forum, plans
Twice, in the past, I have thought it would be nice if everyone’s stuff made it out onto social media. Both times, I have enabled syndicating forum topics. Both times it went badly.
We ended up syndicating spam that is easy to remove here, but hangs about in FediSpace forever.
A bit like this:

I’m sure there must be a way to revoke that stuff, but I’m not sure what that way is. So, until we can undo spam that gets syndicated, forum stuff will remain local only. If someone can help me figure out how to unspam social media, I think it would be nicer to take a poll to see if our active members even want our forums appearing on social media.