I mean it’s his money. He can do what he wants with his money that’s his.
I’m confident he won’t donate because he doesn’t donate to charity. He has his own charity but that’s the kind they all use to skirt taxes and support family income.
Not everybody is the donating kind of person. Elon Musk is not the kind of person who donates. He receives. That is why he is wealthy. That is capitalism and he is a god.