If we look at the positive aspect of this: it means Meta looks at Fediverse as a competitor and tries to do something around it.
Unfortunately things could only be ugly.
Meta running an instance won't appear I think because it could be blocked. But taking control of big instances thanks its money might happened. And maybe has already happened and we don't know it. Meta or another big tech company.
It would be extremely funny if Meta spent a shit load of money buying a bunch of large fediverse instances then everyone just immidiately migrated to other instances and defederated them.