[mosselman]

In my experience, the Android and iOS app stores differ a lot in general quality, with the iOS apps being the better ones. Partially, I theorise, is due to it being harder to publish on the App Store than on the Google Play Store. This means that lesser developers and companies will publish more poorly made apps for Android than they will for iOS.

Now, with PWAs, it will become a lot easier to 'publish' 'apps' for iOS, which means that even crappier icons will find their way to your homescreen than would have if all of Android's apps were available for iOS.

That is how I understand 'contaminating' at least.

Some background: I used to have an Android phone and for the last 4-5 years I've had an iPhone. Sadly I still need to help lots of family and friends with Android phones when they are having problems, so I am still familiar with the apps for Android.