The ones who don't get corrupted tend to live quiet lives after they reach a high level of wealth.
They're trying to get their way, money is one means. They're trying to implement something they have in mind, outcomes, money is very useful for that in most cases. They're not trying to get more money as the thing unto itself, it's a tool of power/control/influence.
People that have never been near extreme wealth usually fall back to the very primitive reasoning of: it's just money grubbing, it's base greed. Because that's bumper sticker simple thinking that is easy to cuddle up to.
Back in reality, Musk, Bezos, Zuckerberg, et al. these people are humans, they want things, they want outcomes, they have notions for how they think the world should be. Money helps them pursue that, it's nothing but a tool for them, a means to an end. It's comically foolish to think the money is the end.
But this is exactly why people shouldn't be able to accumulate that level of wealth and progressive taxation levels should reach 100% beyond a certain level and we should fix the tax code to tax all wealth and not just standard income.
That much wealth accumulation is anti-democracy.
Nobody elected them to have as much power as that wealth buys them.
I saw a recent interview with Bernie Sanders and they were asking him about how Elon Musk doesn't really want more money (i.e. an extremely small amount of his net worth is in cash). Sanders replied along the lines of "Sure, I agree with that, but the alternative is worse. Musk wants to buy elections, he wants to muscle his way into government in completely unelected positions, just to enforce his will on the rest of us."