From a conceptual level, it makes sense to monetize a platform based only on the people making money. Like how game engines are generally free to use for games that make little or not money.

On the more practical side, it's kinda hard to make yours work. You probably don't want to charge a popular free app like Wikipedia the same as an app like Netflix.

I don't see how any developer nor consumer would benefit from "pay your monthly play store fee to access the store". Imagine if credit cards also worked this way.