If you've ever tapped on a search result on your phone only to see a giant ad imploring you to install the site's app, you know how annoying that can be. Google realizes that too, thanks to its own internal study that showed users often don't click through when they encounter these ads. Now Google wants to change that by downranking sites that pull such a stunt. Starting November 1st, any site that uses large app install interstitials will no longer be deemed "mobile-friendly" by Google, which could spell disaster for the site's SEO. Other interstitials will still be okay, however, and Google is encouraging the use of less obtrusive app install banners instead. While ads aren't going away entirely -- this is Google, after all -- at least it looks like they'll be less aggravating in the future.