For my users having a PWA is completely irrelevant. Once they add it to home screen it's an app for them (I don't even bother to explain anymore).
It might be a discoverability issue since they can't find you in app stores though.
isn't it a small racketeering/marketing price for the promissed discoverability?
Depends on your audience on whether this will actually be worth the investment. Being on the app store doesn't necessarily make you visible anyhow. It's just easier to install for apple users.
In that situation I don't think charging more would go over well with consumers.
Have you seen this done?
Netflix offers in app purchases for streaming subscriptions if you pay through their games. But only the ad tier.
You can subscribe to YouTube or Hulu via in app subscriptions. But you can’t subscribe to YouTube TV or Hulu Live TV via the app.
I guess these days I would offer a higher month to month subscription through in app purchases and a lower yearly subscription from the web.
70% of something is more than 100% of nothing (especially when the product is software or something else that has a marginal cost of production of essentially zero).