The User/Developer distinction is completely arbitrary. Any user can download Xcode/Android Studio and develop for their device which has the same libraries ins

The User/Developer distinction is completely arbitrary. Any user can download Xcode/Android Studio and develop for their device which has the same libraries installed as an SDK including analytics/debugging/ads and such. Google used to charge developers a one time $25 fee, and Apple could charge as little as $5/developer/year to cover everything related to the App Store. The Swift compiler is common across a few Apple devices, and the device buyers are paying for that.