My understanding is that a PWA is just a website with a few extra features. The ability to "install" it is one of those features, but it's still a PWA even if y

My understanding is that a PWA is just a website with a few extra features. The ability to "install" it is one of those features, but it's still a PWA even if you don't install it and just use it as a normal website. So basically a website with a service worker that has some offline functionality is a PWA. Tons of people use those without even knowing it, and there's no good way to measure that.