You can say what you want about Musk (I personally think that he is an appaling human being), but Starlink represents everybody who pays for starlink to get access to the internet, not just Elon.
Yes. But by allowing a monopoly to exist each of those customers has the risk of being forced off the service by a terms of service change, price gouging, or other predictable monopolistic behavior with no alternative. And this is avoidable by ensuring a competitive market or regulated utility.