That is naive look on it. Meta(Facebook) is a company, it's always company interest and only company interest. The idea of fediverse is to stay out of data tracking, user profiling, not to help it in any way. Connecting with meta is workoing aginst fediverse. It might be a mistake fediverse never recovers from, even now it's really small fedi community.
Why would we as fedi users, mods and admins help meta or any other company, for what, for their interest that they sell on "we love fediverse", "cusotmer first" bla bla bla.
How would defederation from meta lead to killin fediverse ?