"What if someone outside retoots your toot and that person federates with meta?"

well here is the neat part: a retoot is an object that says "hey ive retooted this : LINK TO THE POST".

Well, to access to the "fediverse object" you need to (postal 2 voice) sign the petition. With the petition signed you can see who is asking for it. "holy shit its meta and this user hasnt said anything about it yet. nope, nothing here for you"