They aren’t really the same answer.
People suggest that Mastodon is too complicated for the average knuckle-dragging moron to use (and it might be, but frankly I consider that a pro, not a con) because it has “servers”, as if the entire point of the internet wasn’t to have a global network of communication across a multitude of clients and servers. Do these same people think the concept of websites and email are also too complex for the regular person? Maybe… But again, if the regular person is that fucking dumb do we really want have them in our community at all?
What’s more, BlueSky is supposedly federated (or “will be”™), and as such it’ll have to deal with all of the same challenges around federation that Mastodon deals with, and people are kidding themselves if they think otherwise.
Otherwise I agree with your last sentence. Social media is about money and fame, first and foremost. The average person will always go where the most money and fame are concentrated.
Oligarchs get cozy with oligarchs, what a shocker.