You misunderstand Musk's motivation. This was never about money for him, but about control over a key technology. One of the main reasons he exited OpenAI was the fact that the other co-founders wanted to create a structure where no one, Musk included, would be able to seize full control of the company. That was the thing that prompted him to leave, which tells you a lot about what he really wanted in the first place.
But he also falsely assumed that OAI would die without his money. Yet, they managed to pull through, and Musk is now on the outside looking in with very little influence in the AI space. xAI is his desperate attempt to get back into the game. That is why he won't give up.
But he also falsely assumed that OAI would die without his money. Yet, they managed to pull through, and Musk is now on the outside looking in with very little influence in the AI space. xAI is his desperate attempt to get back into the game. That is why he won't give up.