You could go down to a record store, hosting a trivia night, that's a game. Then buy some records, and talk to a nice potential partner.
Done, you've accomplished all of these things without the use of IOS!
Less cheeky , you can do all of those things on a PC, on an Android device, etc.
Apple wants to get paid twice for the same thing. Apple sells me a device, and then they sell me (a device user) as their product to app developers.
The iPhone did not originally have an app store and was still highly sought-after. Apple chose to add an app store, and has every right to choose to do so under their own conditions.
Apple charges for (in-)app payments literally 10 times more than competing payment processors. Apple bans apps from using competing payment processors.
Apple also bans apps from even informing consumers how much this costs, or that other payment options may be available elsewhere. There's no pro-consumer explanation for forcing opaque pricing and uninformed purchases.