People don't become billionaires by paying their fair share and not screwing people over. I remember hearing jokes about how you need to be a sociopath to be a great business person, but the reality is that in order to maintain and grow massive wealth, you need to be willing to take advantage of others for personal gain and pay back literally the least you can get away with. Playing fair is for suckers.

Note that I'm not even talking about taxes. But tax avoidance also becomes a lot easier the more money you have.