These same tools are what allow you to build and ship fully JS based apps on iOS instead of having to use Swift or Objective-C or anything like that. Arbitrary web views can be an entire app. Or they can reinvent the wheel and become in-app browsers. A lot of apps are fully or partially web based. Even Apple’s own apps use web views in crazy ways. For example, the entire Mac App Store used to be a web view. Parts of macOS system preferences are web views. It’s just that because they’re web views, if you slap browser-like chrome on them and send them to the internet, they also work as web browsers.
All of that is totally fine and not what people are upset about. If your entire app is just a web browser that renders your website, that should be fine too.
The problem is when they render external websites and unsuspecting users think they are using the phone's web browser. That is something Apple/Google can have rules about without banning/restricting web views.
