You could say the exact same thing about the long-standing policy of providing free 911 service via terrestrial cell towers. And it still wouldn't make any sense because the revenue potential of 911 service is absolutely miniscule compared to the total size of the telecom market. Giving away 911 service isn't pushing anyone out of the telecom business. Despite being life critical, 911 service is incidental to a good overall telecom service and it makes perfect sense to make it free.
> This is all well and good while SpaceX continues to operate, but what if it goes bankrupt and the world has moved on?
There is zero chance that the Starlink network would be abandoned and stop working if SpaceX went bankrupt. Look up Iridium and Globalstar to see what would actually happen.
> Or what if Elon has another tech bro moment and decides some region doesn't deserve this service anymore?
Again, people are delusional to think that he would leave people to die on a whim. I get that he acts rashly and there's a real billionare=evil meme floating around out there right now, not to mention the politics stuff, but nothing he has ever done is even remotely close to the behavior people are postulating here.