Relative to almost anything else a consumer might want to choose in their purchasing lives, tapping a screen a couple of times doesn't seem to qualify as difficult. Definitely not as a restriction of consumer choice.
By “tapping a screen a couple of times” you’re referring to the process of enabling side-loading on Android?
Because if you don’t think that’s a problem, then you must be living in a bubble surrounded by techies.
Imagine you’re trying to start a competing app store. What does user acquisition look like for you on Android? Besides the regular ad spending to promote your app, you also need to figure out a way to guide consumers through the installation process.
Even if you manage to solve that problem effectively with some kick ass tutorial, your main competitor doesn’t have to worry about that. They will always be advantaged no matter how superior your product/service is.
And that’s just the side loading side of it. There are many other anti-competitive things Google does on Android to maintain their monopoly.
I have the consumer choice to buy any compatible car battery I want. That doesn't mean it's easy to install. Unless I'm living in an ivory tower with people who find app stores easier to install than car batteries.
Ease of installation (which, again, at least in my rarefied atmosphere of people who find tapping a screen under 10 times [0] easier than, say, going and buying a compatible battery, remove the old one, installing the new one, and disposing of the old one) still isn't particularly to do with choice. Android certainly has choice. It's Apple that doesn't.