I don't think your analogy is making any strong points, because there aren't just two supermarkets in the whole world.

I can choose from 4 different supermarkets within walking distance, and an additional 3 if you count online supermarkets that deliver to my area. That is not the case when it comes to choosing a mobile OS/app store.

I bet each one of them has exclusive products not available on the other ones.

Having more than one to choose from is still an option.

Yes, and I know several of my friends and family who shop in different supermarkets for that reason. How many do you know that have both an iPhone and an Android phone?

Plenty, I am one of them, I am Windows/Android user, and get Apple gear from work.

And I also know a few that still use and buy feature phones with their OEM only apps, with "by invitation only SDKs".

Which makes the choice bigger than two actually, when one looks at the actual market distribution, something that a judge will care about.

are anecdotes data, now? does fortnite run on feature phones? how many cases have you tried in federal court?

As many as the wannabe lawyers in HN driving their Apple hate agenda without any legal understanding.