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Bluesky hits 20 million users
(www.engadget.com)
This is a most excellent place for technology news and articles.
Two different questions.
They are a gateway to federated material as any other (like Lemmy), and those controls are at the platform. They can gatekeep federated content very simply.
There is nothing stopping them from leaving it all open aside from costs though. Hosting is very expensive, and I'm not sure how they plan to support their platform aside from advertising, at which point you may be stuck in a spot where you shut down certain intersections to appease advertisers.
They currently have no plans for advertisement.
On what they're currently planning to bring in money:
https://www.theverge.com/2024/10/24/24278666/bluesky-working-on-premium-subscription
That could change at any time, but seems likely to be true for now.
I would guess things will be fine at least up until they either IPO or they get bought by a VC firm or some public corp. That's the point in the ensuing to fixation cycle to move to something else (unless something unexpected happens like they really do nicely federate before then or something else that may save the platform).
So I'm guessing probably at least a couple years that it'll be good, and it's 10000x better than Xitter.