Steam doesn't belong there, as it's not the only avenue for developers to distribute games on PC. Even Google Play is iffy, as developers could distribute thro

Steam doesn't belong there, as it's not the only avenue for developers to distribute games on PC. Even Google Play is iffy, as developers could distribute through 3rd party app stores or sideloading, though Google makes that harder than it should be. Apple is really the only one of the 3 you mentioned that forces a 15/30% cut if developers want to distribute an app on their platform.