It's not Meta who is going to want to federate with us, it will be a stealthy instance, for example from a videogame, so popular that everyone will want to federate with it. Including the gamers of our instance. And then this instance (which will be a facade of Meta) will implement a feature in the protocol, for the need of their videogame. Oh something really trivial....then something else. etc. And slowly the federations will diverge toward Meta.