If nothing else I'm sure self interest is a huge part of it. I'm no fan of him, but he does tend to be treated as the face for social media, especially when it comes to government looking to pin everything on. In reality, he's not doing anything all social media isn't doing aside from Twitter. Can't entirely blame them either, you're risking a lot standing up to the Feds when they come knocking and they certainly have plenty to lose by not playing ball. But, Musk has also shown them it can be done.