As announced by Google two months ago on its official blog about the update that after November 1, the pages that hide content to show an app install interstitial will no longer be considered mobile-friendly is now gone live.
As posted on Google plus:
An update to the mobile-friendly algorithm
Starting today, pages with an app install interstitial that hide a significant amount of content on the transition from the search result page won’t be considered mobile-friendly.
Instead of full-page interstitials, we recommend that webmasters use more user-friendly formats such as app install banners. We hope that this change will make it easier for searchers to see the content of the pages they are looking for.
Now we will have to see how many of them got affected by this update.