If companies can install stuff outside of the app store to save a 30% a LARGE number of companies would absolutely do so. To say hamstringing the browser on iOS isn't a calculated choice to say "but you can install webapps* (* with shitty safari)" and then completely cock block web browser choice isn't a 100% calculated choice to limit consumer choice is a disingenuous lie.
"80%"
You think that Apple isn't going to hold onto the 20% come hook or crook? in any means necessary - including locking you to the App Store and the 30% cut - despite the fact that alternative payment methods are completely reasonable? and how much of that 80% is through games on the app store that REQUIRES a cut through their ham fisted and unreasonable restrictions? That's even more reason to give consumers and companies options outside of the app store and the mafia requirement for a cut.