It's not just funding. Apple changed webapps to delete indexedDB periodically even if they are inatalled on the home screen.
There's no way to have a great experience if you can't store data permanently.
Ask yourself the same question about Native Apps. Why should any Native App be allowed to store data permanently. The answer to that question is the same for Web Apps.
Web Apps can be every bit as capable as Native Apps except with security and privacy built in. For consumers, businesses and competition, Native Apps need to be relegated to to apps that require cutting edge use cases
2. You (as a user) lack autonomy or control over them.
3. While built on "free and open technology", they are not by design.
4. Is totally subject to the whems, taxes, and control of the gatekeeper (the app developer)
Web applications have demonstratively made the experience worse for users without them knowing it. And web app developers know this intrinsically and refuse to acknowledge it.