This exemplifies some of the reasons proprietary app store lock-in is bad for consumers. Progressive Web Apps -- web apps that are installable and available offline without any app store -- are a viable alternative, and ultimately a threat to Apple's app store racket. It's likely why iOS Safari continues to drag it's feet on PWA support.
I agree with that. However, what worries me about PWAs is discoverability. How can I find a catalog of available PWAs to download? Is there a way?
If your app can be distributed as a PWA, then the question becomes: is the App Store (which gives you discoverability) worth the 30% revenue cut? For some PWAs the answer will be no.