You probably don't get it, but the real issue here is that this dude is essentially making money off of somebody else's intellectual property.
It's easy to dismiss because it's not your intellectual property that's being misused here. But if you made a character, built a company and video game and merchandise around that character, and then you see other people making money off of the popularity of your character without your express permission, things would be different.
Now if he was making money off of rip-offs instead of your actual characters, then that changes things.