I wonder if you could write a wrapper over Steam (and other services) that allows the same benefits of them, but lets you have your own store too. You'd have a

I wonder if you could write a wrapper over Steam (and other services) that allows the same benefits of them, but lets you have your own store too. You'd have a launcher that could launch any game on your computer, whether it's on Steam or GOG or Itch or your own service, and a global storefront that merges them all (and prioritizes yours). Would that even be legal?