I thought this was slightly funny.
Mark Zuckerberg is known these days for wearing t-shirts with Latin phrases on them, especially ones where he compares himself to Julius Caesar.
Bluesky made a shirt in the same style, but theirs says “a world without Caesars” in Latin.
Their federation doesn’t work the same as Lemmy & Mastodon there’s no federation to individual servers.
If Bluesky introduced ads to their app, you can take all Bluesky data from the relay and host your own app without ads. This is working today and easy to do.
If they started charging for access to the relay you can host your own relay and it will parse all users data for you to use. This is also working today but it’s a little expensive.
Something would have to SIGNIFICANTLY change with the protocol for Bluesky to change how the relay interacts with the PDS, that would require such a large infrastructure change there’s no reason even questioning further.
The reason you don’t see anyone doing it right now is because there’s not much incentive to. On Lemmy we’re each on our own little “community” but Bluesky is just here’s everyones data no matter what when hosting a relay.