Theoretically... yes and no? First of all it's a given that any truly rich person in today's day and age is a capitalist, no exceptions.
Modern capitalism is based on the assumption that "maximizing profit" leads to the best outcome for everyone... which is not true. So if theoretically a rich person is trying to be 100% rational then they cannot be "good"
On the other hand... also theoretically, rich ppl have a lot more resources to give and support causes they care about, so on this aspect they could be good? I know ppl who donate a ton to social causes but I honestly don't know how much of their donations can be attributed to tax benefits
In practice... I guess most of what you could call "good" people wouldn't want to make that much money in the first place? Or it could just be probability, good people and rich people are both quite rare, so good+rich is even rarer (if we assume they are independent).