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Meta just showed off Threads’ fediverse integration for the very first time
(www.theverge.com)
This is a most excellent place for technology news and articles.
they could develop new features but intentionally implement them in a way that they are not compatible with other services. they could put all the other instances they federate with on rolling blackouts so that it seems like they are down when in fact it's just them cutting the connection. doing just these two things with purpose could make it look like Facebook has the most advanced and stable instance. in addition, as you mentioned, it would also have the biggest populace. there would be pressure to abandon other instances to join that instance to stay in touch.
The people making the most noise about it don't seem like they're pressured one bit. Also, walling it off through defederation won't stop any of what you propose may happen, anyway.
Why would that happen anyway? A lot of people already came here from bigger sites, like reddit for example. If we don't federate, then why would people who are already here be pushed by something that isn't there?