China is an authoritarian government that is able to take direct control of any Chinese company. Like, explicitly. More or less all Chinese companies should be treated with suspicion.
Musk is a shithead but not, to our knowledge, an agent of a foreign hostile government. Turning twitter into a place that promotes hate speech is legally protected free speech, although specific statements that provoke violence may not be protected. Contrary to popular belief, there are many exceptions to free speech.