I noticed your biggest issue with in-app purchases is that it's different implementations for each platform. That issue doesn't exist in the cryptocurrency space. Also, many modern cryptocurrencies have JS implementations so it shouldn't be too hard to add. One thing I would look into is if it's allowed on Apple's AppStore, but I can assure you that it is allowed on Google's Play Store.
Hey Ben,
I noticed your biggest issue with in-app purchases is that it's different implementations for each platform. That issue doesn't exist in the cryptocurrency space. Also, many modern cryptocurrencies have JS implementations so it shouldn't be too hard to add. One thing I would look into is if it's allowed on Apple's AppStore, but I can assure you that it is allowed on Google's Play Store.