I’m not sure if federating will help meta so much as it will definitely (most probably) hurt the lemmy/mastodon network.
Here’s a similar case that happened before, with the XMPP protocol being coopted by google but eventually killing it in favor of their own proprietary solution:
https://ploum.net/2023-06-23-how-to-kill-decentralised-networks.html
Big tech isn’t on our side, and we have to handle outside corporate influence with heavy skepticism.