Who said Apple is choking Android? Apple is choking app-developers within the iOS ecosystem.
Right, but one manufacturer's device does not a market make.
For paid apps, it does. App store revenues totalled some $60B in 2017, and guess which app store saw an overwhelming majority of those dollars flow through it. There's your market
Would not suggest you use that phrase again. One device restricted to one store is a market. Just not the whole market.