I co-founded a company called App.io which ran from 2012 to 2015. We let people run iOS apps in the browser and we did it by streaming the simulator from virtualised macOS instances. We were running EXSi on Mac Minis colocated in data centres around the world and the system ultimately worked really well (we definitely had scalability issues with such an unconventional setup).

We were quite tight with Apple. We had meetings on campus with senior executives that led to a pilot program with iAd where people could actually play games as an interstitial ad unit. We had employees at Apple who were dedicated to working with us to run this pilot program. Apple ultimately decided to shut down iAd which doomed our collaboration and possible acquisition opportunities.

So this move is really fascinating to me personally. Apple knew how we were doing it and embraced it, probably because we weren't competing against them or undermining the security of their OS.