If you come up with a great idea, then Facebook can either steal it from you or buy you out without them having to spend the funds to test all of the potential options.
Facebook hasn't had a good idea for over a decade (and even that one was trash), so they need a little help now and again.
Meta doesn't have a business providing straight up API usage. This is a new market, if they can get startups relying on Llama hosting, then there's no reason this can't be a whole new market.
Meta wants feedback from startups on how Llama can be improved.
Shut it down is the best thing you could do for it and for society. You work for a spyware company.