Hypothesis: this is not about Elon running Twitter, controlling society, insuring free speech, or any other such thing. It's simply that he wants insurance against being de-platformed, and now he has it.
9% is a hell of an insurance policy. I don't disagree, the man does not do small things, but I do wonder if he just bought insurance for more people than himself.
I mean, you say that. But the literal former president of the USA got de-platformed from twitter, and we don't hear about him nearly as much as when he had a twitter.
Maybe it is actually worth that amount of money, if entire elections can be influenced like that.