Ask Microsoft, who tried developing Windows Mobile after the market was taken over by iOS and Android. Or who still tries competing with Chrome without much success, despite it being pushed on Windows as the default, with annoying settings and ads included. Nevermind that they gave up developing their own engine because they couldn't keep up.
Microsoft has been doing various flavors of mobile OS development since LONG before iOS or Android. The first release of Windows CE was back in 1996, roughly contemporary with PalmOS and Apple's NewtonOS.
Ask Microsoft, who tried developing Windows Mobile after the market was taken over by iOS and Android. Or who still tries competing with Chrome without much success, despite it being pushed on Windows as the default, with annoying settings and ads included. Nevermind that they gave up developing their own engine because they couldn't keep up.