I'm not worried about Threads joining the fediverse. They can't even properly implement hashtags and trending topics, which already puts them far behind Mastodon and X.
Also, how would users on a microblogging platform be able to interact with a Lemmy instance? I'm a bit confused about how ActivityPub works in that respect.
The 'they can farm our data' argument is a bit moot when Lemmy is already publicly accessible, and it makes us no better than Spez if we are trying to combat people for 'data scraping"