I feel Ionic is more engaged into open web than big companies trying to enforce their own standards. The question is when Appple and Google will start blocking (outside of walled garden app stores) hybrid apps?
Why would they block hybrid apps? Apple only cares if your hybrid app loads its code at runtime. They couldn't care less if it's JavaScript.
Edit: If by "hybrid app" you meant "progressive web app", then yeah, Apple has made it somewhat inconvenient to pin websites to your home screen as apps. But they'd never really be able to block them altogether without blocking the web itself, because there's no hard distinction between the two.
We see that sometimes and it's almost universally apps that are just websites wrapped up, or more "brochure" apps. Apple doesn't like those, but it has nothing to do with Ionic/Cordova/Capacitor.
Were you going out of your way to circumvent native functionality somehow? A calculator app probably "doesn't use much native iOS functionality", but I don't see how that would get it negative points on App Store approval.
That's your issue then. They have rules to stop the App Store being flooded with website wrappers. For it to be in the app store, there needs to be something it offers to make it worthwhile for users. If it's just a website, they can just use a web browser and pin it to the home screen if it's something they use frequently.
Edit: If by "hybrid app" you meant "progressive web app", then yeah, Apple has made it somewhat inconvenient to pin websites to your home screen as apps. But they'd never really be able to block them altogether without blocking the web itself, because there's no hard distinction between the two.