https://webmasters.googleblog.com/2015/09/mobile-friendly-web-pages-using-app.html
No kidding! “However, sometimes a user may tap on a search result on a mobile device and see an app install interstitial that hides a significant amount of content and prompts the user to install an app. Our analysis shows that it is not a good search experience and can be frustrating for users because they are expecting to see the content of the web page.”