Apple is a hardware company with proprietary CPUs and such. They have such a moat that if they open sourced their entire OS stack today nobody would be able to do anything with it except by buying their hardware.
But the issue with the app stores is the app fees. Those must be lucrative enough to want to keep that gate for themselves.
But the issue with the app stores is the app fees. Those must be lucrative enough to want to keep that gate for themselves.