Meta cannot harm you by federating. If they want your data that you posted on kbin then they already have it. They run curl and they can swallow all your posts and metadata associated. Whatever you post is given for free to everyone with an internet connection.
Also Meta probably will never federate since it involves a huge risk that they will end up hosting illegal data against their will.
edit: also think in legal terms, meta will never publish content on their site if a federated server hasn't signed a mountain of legal documents beforehand. It's simply not happening. I'm only speaking on a user level. If our admin adopts a pro-facebook stance then of course it's a different story.
edit: The more I read about this the more doubt I have about this story. It seems that kbin still hasn't signed the fedipact? It's becoming a big deal and it will affect kbin even if we adopt a neutral stance. There is in fact no more neutral stance. We should sign.