I didn't like the way Microsoft acted as a monopoly, but the tech industry managed to survive and escape Microsoft hegemony. Microsoft made some terrible software, but Office is actually very good overall and can argue has led to real productivity gains for many businesses. (I realize this can be debated endlessly.)

Everything I've read indicates Gates takes his philanthropy very, very seriously and is having a real impact on improving people's lives. I'm sure his foundations are not perfect and have problems, but I also believe they are a net benefit to the world.

Interesting to contrast with someone like Steve Jobs. His company arguably produced much better products impacting (shockingly) many more people, but he didn't give a dime to charity (as far as I know). Could have long philosophical arguments about who had the more positive impact on humanity overall.