More like Epic. Valve had 15 years to consider a steam store on Android games (and honestly that was my biggest hope with all this disruption. Proper premium games to come back to IOS/Android), but they only really have a front end for the PC store in that time.

Epic has had an Android store in the roadmap since the beginning of the EGS. They still seem years out but I imagine this news will accellerate development for that.

I would say yes.

They definitely want to "demotivate" big players from running the show. If they do, they'll have to pay huge fees, so it's a big win for Apple.