But is the work of the app store flat fee for an app? I think if you have a massive userbase and drop an update etc. this requires way more of Apple's resources to keep up with, it should probably be a sliding scale right?
And Apple should also be free to offer the % as an alternative if they wish, "don't want to bother with details ? Just stay entirely within Apple's system and pay 30% and that's it". But not strip the possibility of paying by use.
Because again, if I have 500 millions users, delivering a 5 MB update costs the same for a 5$ sub as it does for a 50$ sub, yet Apple's bills 10 times more to the second one.
To me it seems like payment processors are a more direct comparison and they usually do a combination of flat fee + percentage.
Which the developer should be able to opt out of by self-hosting.
Opt out of the battery controller and encryption libraries, to roll their own for cheap?