As much as I dislike Meta, I don’t think we have enough information on this to make a sound decision yet. If they were to participate in the fediverse following the open standards and with moderation that complies with our instance’s rules, then I can’t make any argument against it. The fact that they could just launch an instance like everyone else but instead are trying to get other instances “on board” some secretive project with an NDA really doesn’t bode well though.