If your website has a pop-up prompting users to download an app or subscribe to content, your search ranking will be negatively affected.
We know that Google started boosting mobile-friendly websites for mobile searches on April 21st. But this new announcement will move your websites search rankings down the page, even if your site is considered mobile-friendly.
After November 1, mobile web pages that show an app install interstitial that hides a significant amount of content on the transition from the search result page will no longer be considered mobile-friendly. – Google Webmaster Central Blog
