Developer apps would be nothing without the amazing hardware and software tools that Apple developed. Why do you think this is only one sided? Where is the disrespect?The disrespect with which Apple treats their third party developers is simply incredible.
The iPhone would be basically a nothing burger -- truly -- without third party developers, their IP, their amazing creative work and how attractive all that makes it to own and use an iPhone.
Currently Apple takes 30% and the developer keeps 70% — seems fair to me. If you want another way in to get at Apple’s customers and avoid the 30%, doesn’t that appear greedy and unfair on your part?