true, but it is possible to use it in ways that benefit you or your priorities. I'm not saying that is what Musk is doing, but the ability to spend a billion dollars or potentially charitable endeavours can have direct benefits to the giver.
If I'm gay and donate to an LGBT rights charity, I would love to see direct benefit.
If I play sports and donate to my nonprofit Club, I also hope to see direct benefits.
Charitable donation by definition is donating to things that Advance your priorities. Those might be a world with less hunger, saving lives, or whatever. Nobody donates to charities that work against their priorities.