Even if you like Elon and his companies monopolies are still bad. He is not going to live forever, somebody else will be in charge sooner or later and that person/group may not adhere to same principles.

Monopolies due to the State granting permissions to only one company, or gaining advantages due to coercion or lobbying are indeed terrible.

But monopolies due to excellence in the development of the product, like Starlink, are not bad at all. In any case these are extremely rare and tend to last very little time.