A distinction without a difference.

Difference is in the fact they don’t have any incentive in checking submitted apps to alternative stores. Does it even launches? Does it use private APIs that will break tomorrow? Who cares. Surely not Apple. It’s on that alternative stores.

But if they asked to block an app due to breach of a law, they will oblige.

You argue that they have no incentive to look through all the apps submitted to other app stores. I disagree with this premise.

And even if it were true, it is not a counter argument to my assertion that Apple has complete control over what apps exist on every App Store.

No app goes live or stays up on any App Store without Apple’s explicit consent.

Your argument was that this is a distinction without a difference. I pointed out the difference: apps on alternative app stores exist until Apple is legally forced to remove them.