The more the merrier for the Fediverse

In principal yes, but not at any cost!

Keep in mind that the Fediverse is also a distributed governance model, and it can be seriously harmed if one bad actor gets too much leverage. Meta's business model is to control as much of the users and content as possible, which runs counter to the idea of the Fediverse. They want to use it to bootstrap their new app, but they'll try to superseed it as soon as they have enough leverage to do so.