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Bluesky hits 20 million users
(www.engadget.com)
This is a most excellent place for technology news and articles.
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.