My wife, son and me not using Safari. Do not see how Safari relates to App Store.

We use App Store.

The point of a PWA is that instead of downloading an actual binary app, you essentially get a webpage that runs like it was an app. They can be installed from anywhere and are safe by nature because they're really just webpages.

That was the original conception of iPhone apps, until Steve Jobs realized just how much money could be made from the app store. Now you get to pay Apple a 30% cut for the privilege of installing software on your own device!