No. Big Mac is a brand of burger among many burgers and competing stores.
It competes with Big King from Burger King and other burger from other market participants.
iOS apps are not a brand of apps - they're a whole category that competes only for one subset of smartphone users.
The Big Mac is a product that only exists within McDonald’s ecosystem. Just like iOS apps are software that only exist within Apple’s ecosystem.
McDonald’s controls the only way to get a Big Mac, but that doesn’t mean they have a monopoly on burgers because burgers can be bought elsewhere from other market participants. Similarly, Apple controls the only way to distribute iOS apps, but that doesn’t mean they have a monopoly on mobile apps, because mobile apps are available elsewhere from other market participants.
Sure, I'd tell them (and you): They don't compete for the same customers. Google Play does not compete for iPhone users in the short- to mid-term. And only indirectly at best in the long term.
If I own an iPhone, I don't go shopping for apps at Google Play. I literally can't (use their offerings).
If you say “iOS apps are a whole category,” then aren’t Android apps a different category? If so, Apple doesn’t compete with Android at all, which is clearly false.
Yes, if you own an iPhone, you don’t use Google Play. But that doesn’t mean Apple has a monopoly in the mobile app market. It means you, as a consumer, chose to enter Apple’s ecosystem, just like someone buying a PlayStation isn’t shopping for Xbox games or someone who walks into McDonalds isn’t shopping for a Whopper.
The real question is “do Apple and Google compete to attract users and developers into their ecosystems in the first place?” And the answer is
absolutely. Users choose between Android and iOS, and developers choose where to invest based on the size and value of those user bases. That competition shapes prices, policies, and incentives on both platforms.
...and yet, basically all apps (except a handful of open-source apps with often questionable use) are on Google Play. And many are not.
Which pretty much disproves your argument that a "closed experience" would be taken away from you (an iPhone user) by allowing alternative stores. You'd more than likely be able to choose the same "closed" first-party experience on iOS as you can on Android.
Heads: I win - Apple charges developers too much because there’s no competition, we must open Apple up to lower prices!
Tails: You lose - The prices are the same on the Play Store because competition doesn’t matter, so let’s open Apple for….reasons!
If open ecosystems don’t actually deliver better prices for developers or consumers, then what problem are we solving with these massively burdensome regulations? What exactly are consumers gaining from being forced into a more fragmented, less secure and less private ecosystem on iOS, that by your own admission, practically no one is going to use except for “apps with questionable purposes.”