They have taken advantage of mechanisms that siphons money from the working class. By default they’re not good people. Once you’re old and aging, spending SOME of your massive fortune to try to leave a benevolent legacy, which in itself is selfish, does not make you a good person.
I’m not making a point that his efforts haven’t helped some people. I’m saying that he’s not a good person, even if his money later in life has had some positive effect. A billionaire donating to just causes, to me, is like: if you robbed a bank, putting all it’s employees out of work but then you donate a few hundred bucks to each said employee. Sure, it helped them but you’re part of the problem.