Does it matter who has the monopoly on violence, if you don't? Ultimately, you pay taxes because if you refuse to for long enough, burly men with guns will eventually take your stuff and lock you up.
Why aren't burly men coming for musk? How can my neighbor sit by and let it happen to me when they see nothing happen to him? The man illegally sticking their hand in their pocket.
Call it whatever you want, that's the reality of the situation: Under the circumstances, it doesn't ultimately matter where he got it as long as he's able to spend it.
The reason I would do it is not for monetary gain. I don't believe I'm talking with someone who understands what the implications are of having musk in control all of the US's appropriated funds.