Lol, I think we had this discussion before. Nice to meet you again. :p
I mean I understand this position of yours. And yes, there can't be rich people without poor people, so in that sense I agree being rich is evil by definition. But there is a difference in how to get rich, either by exploiting the weak or those who need it, or by creating good products people WANT to spend money on willingly, without getting exploited. They can get rich this way, which is not really unethical to me. Its a bit of paradox with this (my) argumentation.
I don't think that Gabe is an evil person, or soulless like other CEOs. Especially because Gabe / Valve makes money by creating good products on a free and open market. Other CEOs make money by selling their soul and users to investors (remind you, Valve and Gabe doesn't have investors).
However, there is something I hate Valve (and Gabe) for actually, and that is having lootboxes AND item market in Steam and their games available. If anything, this is what would I call the most evil thing and exploit Valve (and therefore Gabe) does.