But that's not how he got his billions, and he's not contributing anything back really, he's just accepting a little less profit than he could. A serial killer with human body part trophies in their basement doesn't suddenly become a good person if they save a cat from a tree.

Right, and yahoo exploited people to get that money. Are you saying that his work on that site was more of a contribution to society than the entire lifetimes of thousands of tech workers, a few of which probably actually designed and built the site?

And then hoarded billions for a couple decades?

Doesn't matter. There is no amount of work or contribution to society a single person could perform in a single lifetime that would be worth anywhere near $1 billion. Maybe it was another person or company who did the exploitation itself, but he knowingly profited from that.

If you follow the NBA you'll know the storied history of the behaviour of staff for the Dallas Mavericks. I'm not saying he's 100% to blame, but he owned them at the time.