Why are you saying tax avoidance is illegal in Apple App Store? Nothing in their policy says App Store authors shall maximise the revenue share of Apple in their applications.
Whether developers acknowledge or not, when they build their apps for the App Store they're forfeiting 30% off their revenues.
Of course they can build PWA's to try to keep more of the money but Apple will eventually find a way to capture that money. Apple controls the only browser engine on IOS and I don't expect them to investing in features that threaten the Apple tax.
If PWAs become popular enough then Apple will add a browser feature redirects/proxies payments through Apple and they'll take their 30% cut.
Of course they can build PWA's to try to keep more of the money but Apple will eventually find a way to capture that money. Apple controls the only browser engine on IOS and I don't expect them to investing in features that threaten the Apple tax.
If PWAs become popular enough then Apple will add a browser feature redirects/proxies payments through Apple and they'll take their 30% cut.