It is possible to use other app stores with Android. Samsung, Amazon etc have their own app stores which can run side by side with Google's.

There are linux phones, and web browsers

This reply (a version of "if you don't like it, write your own") is the most heinous and disingenuous reply out of the space of possible replies. The sum of time and work required to do that is completely unrealistic: Apple is not creating the ecosystem but rather it is the developers creating the ecosystem for Apple, while Apple is just playing arbitrary gatekeeper and tax-collector as the entity with the monopoly on making the rules. The "value" Apple is adding is essentially negligible if you consider in your calculus that Apple is actively stamping out competition to its platform and further fortifying its monopoly and doing little else. Developers do not choose to stay on the Apple platform anymore than essentially any American can choose from whom they buy their water or electric utility service (privatized utility monopolies are a whole other discussion, but apropos because Apple and Google, through their own extreme anti-competitive actions and policies, have forced people to use their platforms, effectively creating something that walks and quacks just like a public utility monopoly). You could conceivably haul the water yourself from the nearest river, or whatever (I will mention solar panels because where I live, in fact you cannot install solar panels without one of the limited number of permits from the local electric monopoly -- sound familiar?). Developers can choose which of the two monopolies will write the rules for their app -- rules which are almost exclusively about taking a cut and killing competition. But this is not a choice, and saying it's a choice is a kind of absurd baiting tactic. It has been clear for some time that Apple and Google are operating monopolies and staying the ire of the Justice Department through some sort of regulatory capture. I'm sure there are late-90s Microsoft employees that can't believe what they're seeing.

I agree the values are created by developers. Why don't we (developer) deliver our software to multiple platforms equally? Why do we feed the wolf?

Web is a really great platform, both Google and Apple app store allow hybrid app, which is mainly built with web technology and is widely portable.

The typical consumer is not going to use linux.

If we don't facilitate them, they'll never use alternative platforms.