It's because Apple is legally allowed to charge a fee for what happens on their platform. They can do it as a channel cost which is a standard concept in busin

It's because Apple is legally allowed to charge a fee for what happens on their platform. They can do it as a channel cost which is a standard concept in business or they can do it as a fee for using their platform services again another standard concept. If any government were to prevent this it would unravel the entire economy because supermarkets, retailers and services businesses would no longer be legal. Hence why after nearly a decade the App Store is still fundamentally the same as day one.