Sometime (or often?) they have a time-exclusive offer for new games, but it seems they pay good money for this, so it's a simple business-descision for the gamedevs.
Yes? Of course? That’s the whole point of a supermarket. To curate and distribute in exchange for a cut.
To continue the supermarket comparison, it would be like a system where you buy pots and pans and a stove and what not from Whole Foods, but you can only use food you purchased from Whole Foods, and anyone wanting to sell you food would have to sell it through Whole Foods.
For example, Apple doesn't dictate which electricity provider I use to power its devices. Does that mean it's an open platform? Of course not.
The comparison of the App Store to a grocery store is apt. They both leverage their access to demand to control (and extract profits from) the supply side.
It would be like buying a house somewhere and are then forced to only shop at one specific supermarket as long as you live there. No more buying your stuff anywhere else.
All business is bundling and unbundling.
Anyway, the point is that coupling things unnecessarily is dumb. There is no need to enforce coupling of hardware and software like Apple does, the only reason is to ensure that Apples strong points also lets them sell their weak points.
But that's not what epic's doing? You can install EGS and steam side by side. Since there's virtually no lock-in, it's closer to "two supermarkets you can drive to" than "whatever app store you have preloaded on your phone".
Not sure what point you’re making here.
I guess so? They invested and developed their customer base, they deserve a cut of what my products I want them to sell like they take from every product they sell?
This is how the supply chain has worked since the beginning of time.