They don't demand 500€, they demand 2000€. The 500€ fee is for every copy he spreads after this.
Basically, Studio Peyo demands 2000€ for having sent an e-mail. I can't imagine that they need that much legal help to come to the conclusion that this game have breached their property rights. That doesn't "sucks", that's outright outrageous!
I think we should protest this! Demanding him to remove the game is pretty low in my opionion but it's not unresonable. But the fee?! It's scandalous!