Google Play strongly enforce their policy about how an app cannot be something that duplicates the functionality of a website.
Example:
Years ago I wrote a simple html/js app, and published it to the Google Play store using Cordova. It was a completely self contained app and did not access the internet (although it required internet permissions to use the webview). After publishing the app, I reused much of that code and release the app as a simple website.
Google Play deleted my app because purely because the app had a similar version on a website - even the styles were slightly different between them! The reviewer ignored of my explanations and refused to reinstate my app, even after I deleted the web-version of the app.
This was a 5 star app with only positive reviews!
If I got my app deleted because it smelt like it might be a webview wrapper of a PWA, using a service that is a PWA wrapper sounds like the most risky thing ever!