Why are these banners so popular - they are actually my least favourite part of browsing on iOS - every single webapp (GMail, Yelp, Urbanspoon) sticks one of these banners at the top of my page and reduces my real estate and doesn't remember that I dismissed it the first time. I'm not super excited to be seeing these on Android too.
Do usage stats indicate that a lot of people use this feature?
With this project we are trying to be as respectful of the user as possible, so yes it is correct we won't keep re-prompting once installed or dismissed. There is still a lot we are working on fine-tuning the heuristics of this but I am quite hopeful that we will see a reduction of custom banners on the web because we can provide a better experience for sites.
Do usage stats indicate that a lot of people use this feature?