Apple has control over the hardware, the operating system and their own apps but not over the entire ecosystem. This gets them far but only so far. The big dif

Apple has control over the hardware, the operating system and their own apps but not over the entire ecosystem. This gets them far but only so far. The big difference they've made is that they've created tools to make integration with Voice Over so easy, that it's a no brainer to do what little work needs to be done to make an app accessible and to increase demand for it. They've managed to turn a burden into something that has an obvious economic benefit for app developers. Also I'm fairly sure that there is actually a good RoI. It might not be massive but in the long term having the monopoly on phones for blind people surely pays off.