Although Google has not made any official changes to its cryptocourrency and ICO policies, many companies working with the ICO have reported a significant drop in the performance of advertising campaigns on Google's platforms.
An anonymous marketing company specializing in IoC marketing recently provided financial magnets with those scorecards, which show that the company has seen a 99% reduction in clicks on the Google AdWords campaign for just two days. SOURCE https://news.bitcoin.com/anecdotal-reports-suggest-google-cracking-down-ico-advertising/