So at the moment Apple hold the 1st place in mobile OS marketshare, I feel the unfortunate thing that will happen as marketshare drops Google will slowly move to supporting projects other than android, and eventually drop support entirely and focus on making better iOS apps, Device makers will start making their own operating systems with tighter locked down appstores in order compete with iOS, we already see this with Amazon planning to switch to a linux based OS in future fire devices.
IIRC Apple only is 1st in sales revenue and sold devices of a single skew. All Android phones combined have a far bigger share by volume.
Which makes sense, since iPhones are on average incredibly expensive, especially for many countries where they have to be imported.
fyi: it’s SKU, not “skew”.