Doesn't matter, you shouldn't trust billionaires period. Every single one has exploited people left and right to get where they did. They don't care one iota for you, why do you care so damn much about them?
As I said above: "Don't expect them to feel a sense of obligation if you're going to assume the worst about them just because they are rich."
You say that "Every single one has exploited people left and right", what evidentiary basis could you possibly have for making that statement? There are thousands of billionaires worldwide, could you name even 100 of them off the top of your head, much less explain how each and every one "exploited people left and right"?
If your goal is to get billionaires to donate, hating them indiscriminately is not a good way to do that, since that means there's no incentive to give.
And you are pulling that theory completely out of your ass.
I highly doubt you have met Bill Gates or spent time with him or have the slightest idea about what his private thoughts are on anything.