Whats the difference between Starlink and say all satellite TV networks available anywhere, to anybody with antenna pointing up? What can he do, sue an American company for allowing freedom of speech? Musk can safely ignore that, and Turkey would need his empire more than Musk Turkey (to be clear I can imagine erdogan strongarming US government due to Nato bases but he would be showing off some nasty side of himself)

You can't block Starlink signal, it ain't cable in the ground or in sea you can cut at your will.