Couldn't they also just let you check a flag instead of checking for a magic number / proscribed id?

And to be more specific on my question, I get that they don't allow apps to punish users explicitly for OS-enabled choices. But what about rewarding users? Ie you can play/use the app however you want. But we'll give you 50 coins/10 loyalty points/whatever if you enable location tracking?

I mean to follow this all the way through... it should mean that apps can't choose to show, say, rewarded video ads (presently a $1B+ revenue/yr industry on iOS) only to users who have do not restrict ad tracking. Because then by definition only users who don't restrict ad tracking could get the reward from viewing the video. Will this be the case? It's an important question and a lot of startup value could be effected depending on the answer.