I tried to find an iOS habit tracker the other day, but eventually failed because I can’t tell what the actual cost will be, it’s all In-App-Purchase at this point.
Now add that you can’t even be sure that apps you “purchased” will continue to be available.
The app store model is broken, there’s also zero chance that I will buy anything from any app store anymore. I’ll download free apps that solves a problem, like buying a bus ticket, but that’s about it.
Apple does give a crap about the quality of their app store, as long as there’s no porn and you both directly steal, they simply do not care.