I can understand dhh's frustrations. Apple should really only deserve the 30% if they referred users to HEY via the App Store. Outside of that is just unfair and predatory.

This is similar to what Wix requires when you develop for their platform. Wix requires developers to profit share 20% of your revenue for any customers that just so happen to use the part of your app that communicates with Wix. Why do platforms continue to think they're entitled to such a thing? And why would any developer want to integrate with Wix with such a clause?