This is the way I see it. Musk is bought by a broad pro-fascist international front. That includes Russia, China, Saudi Arabia, the US right wing, and now Israel. People like him are easy to buy. They tend to be fascist in nature, but that nature often lies largely dormant in them for a considerable length of time.
This broad pro-fascist international front recognised Musk as an unstable, ego-driven headbanger. A Trump type, obsessed by the adoration of cretinous fascist and/or incel fanbois, of which we have a few on this forum. A sort of a global Sean Quinn, except younger, more drug addled, and much more deluded about the myth of his own genius, without Quinn’s actual business ability.
Why get your man to control Twitter? Simple. Because Twitter being controlled by such a charlatan greatly aids the advancement of global fascism.
Even if he runs the thing into the ground, the broad international pro-fascist front is fine with that as a loss leader, such an event would still greatly aid the advancement of global fascism, because Twitter, for all its faults, had a lot of value as it was, when its moderation policies were merely bad as opposed to openly pro-fascist.
None of this is that complicated. The fascists identify the potential chaos agents, and then manipulate them, massage their ego, and they’re bought. It doesn’t take that much. Conor McGregor has undergone a similar process and look where he is now. All it took to buy him was a take away pasta meal at the World Cup final and a selfie with Putin.