Each platform is independent and tries to fund itself. If I was working/forcing subscriptions, it would be different; I would likely offer a universal access to subscribers. Currently, each platform is friendly priced. On the web, users donate what they want; on mobiles, price is fixed around USD 10 for a lifetime access to all sound generators, current and future (currently 200+). The difference is that I program the web myself and it is my responsibility to live from donations. Mobile apps are subcontracted to a professional coder, hence the difference in models. I know, it is not easy to understand, when you don't know where the project comes from. I can understand your frustration. Feel free to send an email to me if this answer leaves you unsatisfied.
