Regarding the last point, this is what the altcoin Game Credits is working on. Its a minable coin that likely is functionally very much like bitcoin, but is working on usecases with games. Making deals with game developers and coding platforms so that they can intigrate Game Credtis payment functions for both games and ingame items like collectables.

You can alreaddy buy games with it via theyre client. So this is being worked on.