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.
So much of the software industry has been consolidated into the hands of a few monopolies. Web, with all of its horrible problems, is pretty much the only democratic platform we have left, and even it is constantly being eaten away by these monopolies.
It's your device. If you want a website to be able to store data permanently on it, it is your choice. Not apple's. Not google's. Fucking yours.