I would separate here, Bezos is evil because he is just amassing wealth, avoids taxes and pretty much is focused only on himself.
Contrast that with Cuban who is also amassing wealth, but also is trying to do what is good for the community.
Bezos has donated a lot to charity, including $10 billion to fight climate change and $100 million to food banks in 2020. Sure, he could donate more, but % wise that's probably more than many people reading this have donated in 2020. And I don't want to start a debate over it, but I do believe that the primary intention behind Blue Origin is to benefit humanity.
The main issue with Bezos is worker conditions at Amazon, I think.