The Apple store does not replace any open standards, it is merely an alternative. Apple cannot and does not you from using or paying for open hardware and software.
With this in mind: It’s arguably also intellectually dishonest to pretend that we all woke up today in some kind of “iOS only world” and should now regulate it. a) It’s not, and b) you would be killing the very thing that made everyone want this ecosystem in the first place.
If all the “regulate them!” and “open the store!” people win, then history says most will eventually move on to a new ecosystem that works like the old one (which people evidently like). Android has been open the whole time and the money gravitates away from it... If highly regulated and fully open phones worked so well then iOS would be a footnote in history books, and not the powerhouse that you want to squash.
"Voting with your wallet" entirely ignores what actual voting is. Whatever the original reason no longer applies, now the devices are an expectation for livelihood, safety, and overall communication. It becomes a public problem.
Having two choices is not choice. Google deserves the same regulation apple does. Real choice would be dozens of competitive and entirely independent choices. The nature of markets of scale prevent this from happening.