But Heroic Game Launcher and Lutris are not on Steam. So there is nothing Valve lets stand at the moment, there is no game shop on Steam to my knowledge. And if they were allowed to do so, its actually amazing.

But I wonder how this works, because people can purchase games from that launcher and not give any money to Valve, even though its on Steam. This is unheard of. Usually on any other game launcher if you buy anything from an app, regardless what type of app or game it is, then you have to pay to the shop 30% (or less). That’s how it works usually.