He's teaching people how to profit off of getting people (including kids) into virtual gambling, microtransactions and other addictive behaviour, and exploiting

He's teaching people how to profit off of getting people (including kids) into virtual gambling, microtransactions and other addictive behaviour, and exploiting "whales" (who are actual human beings). Historically, there was a way for people to make successful, interesting, exciting and fun games that didn't require horrific financial exploitation of vulnerable players. To quote the Dude: "You're not wrong, Walter, you're just an asshole."