I bet it’s more to do with how little Americans own their own culture. Copyrights in the USA used to expire after 30 years, after which it became public domain. Or in other words, culture was returned to the people as a whole.
Nowdays the copyrights last beyond a lifetime, and Americans grow up in a world where they almost never experience relevant pop culture outside of being owned or controlled by someone. When you find American content, you don’t think of “American culture” you think of “This is owned by Disney” or “This is owned by Paramount” and so on and so forth. You have original authors and content creators, being the gods of the world they created, and everyone else are “fan artists” or “fanfic writers,” being implied to be lesser. Those fan artists will be fan artists their entire lives, and their works will never be ‘canon’ in the eyes of the Owners. If you like Harry Potter but not Rowling, too bad. The public cant reclaim it.
That’s not how culture works though. Culture remixes, reinspires, deconstructs, rebuilds, and memes on. That’s how everyone did stuff before the advent of recorded media. The good stuff is repeated and boosted. In a way, the Internet culture that emerged in the 90s sought out to rebuild what was lost after the 1890s.
Apple and Google’s 30% not only hits the base price, but every single transaction that happens inside apps as well. Imagine a toll bridge in front of your nearest supermarket where the people working the toll booth inspect every bag of grocery you bought and then charged you toll based on what you bought there.
Apps arent entirely like video games. If you wanted to open a non-subscription based music store or book store or whatever, you’d find it economically impossible to pay the publishers their cut, apple their cut, your server host their cut, and have anything left over for yourself without charging your customers their arms and legs. This is why all those kinds of apps are subscription based. You can cleverly batch and bundle stuff in a monthly subscription fee which gives you room to dance around google and apples high fees and have enough money to keep your lights on.