There are countless examples of Musk selectively banning people on Twitter based on political belief, such as this one [1]. And of course, he banned the @elonjet account, even after specifically saying he would not [2]. More specifically to StarLink, he banned Ukrainian forces from using them around Crimea [3].
[1] https://variety.com/2022/digital/news/twitter-suspends-journ...
[2] https://x.com/elonmusk/status/1589414958508691456
[3] https://archive.is/jfdy4