Web app distribution and discoverability are things not addressed in the current web app manifest standard. Mozilla has a API that allows sites to trigger an in

Web app distribution and discoverability are things not addressed in the current web app manifest standard. Mozilla has a API that allows sites to trigger an install with using a navigator.Apps.install() function but I believe browser vendors are concerned about users being bugged by sites that would missuse it. Many websites would ask to be installed even content only sites. I believe Google wants to move from the curated app store model with reviews and ratings to a search results model algorithmically ranked apps. So making a web apps store or adding web apps to the play store doesn't work with their future plans.