Users won't pay a one time fee to use a webapp and theres no infrastructure to do this. Maybe paid up front apps are a dying business model anyway and everything will be subscription based in the future. Theres also just a whole lot missing from PWAs right now, even on Android where they're at least somewhat supported.

Edit: Just to clarify I'm not bashing PWAs I've developed a lot for both the web and iOS and consider myself fairly mercenary, I will jump ship to other tech if need be. But there is still quite a way to go[0] and it's going to be hard to get these companies to agree on some of these standards. I'm also conscious of the fact that PWAs may just replace one dictator (Apple) with another (Google).

[0] https://whatwebcando.today/

the PWA experience is still not so great on iOS. no push notifications, limited service worker support, etc. the only realistic solution for many businesses is sadly a native app.

Web app is not really an alternative on iOS, not unless Apple stops actively crippling PWAs and I don’t see Apple doing this unless they are forced to do so (anti trust).