I’m trying to figure out the gap in the market you’re trying to fill other than “for steam fan boys it would allow us fans of steam games that already exist in a native place, in a non native place!”
Correct me what is going into it that isn’t already somewhere, and who that appeals to?
What would you suggest they sell on their Android store that users would be so encouraged to install a new store and then what they want?
Steam already has a store on Android, you just can’t play games there because most games on steam either already exist on the native google play store, or aren’t compatible with mobile architectures like Arm64. Most mobiles unlike a arm laptop, have no x86/amd64 emulator which is what those games are compiled as by their developers.