This is new territory and it’s changing every week.

Historically, the way it worked is Apple gives almost everything away for free except for a $99 per year fee developers have to pay. But developers who have certain business models (especially game developers) have to pay Apple a huge percentage of their income.

I’ve been an Apple developer since the 90’s - if you go even further back in Apple’s history… Apple didn’t have a walled garden approach. They simply charged money for all their software and that was very successful. Not as successful as the walled garden but still healthy profits.