People moving to FB's "Threads" isn't going to translate to sizable portions moving to Mastodon or other federated services. They are a corporation, they're doing this to springboard. There is no intention to support federation for any longer than it directly benefits them.
At the very best? We simply give them free content and advertising. This is objectively bad. FB's history and operating procedures dictates that they'll end up harming users for profit.
@avrin @stux They'll provide a better service. Leech potential users, and some existing users. They'll use our community to springboard engagement and showcase sustainability to investors.
This is an attempt at prolonging their relevancy and using our services and communities to do it. There is absolutely no benefit here to federate. Them "supporting federation" publicly and having such tools will literally be the extent of the advertising we get from it. There's no reason to let them in.