Google has introduced a Notice that it will ban all the crypto currency related Ads which will affect initial coin offerings(ICO), Bitcoin exchanges, Digital wallets and trading advices
Google has said in it's Blog which Published on This Tuesday that it will be introducing a New restricted financial products policy effective from June-2018 which says "Such ads will no longer be allowed to serve"
Currently Google has not given any specific reason behind the restriction. But This move comes just a month after social media giant Facebook also announced that it would enforce a similar policy that would ban ads featuring bitcoin and initial coin offerings in bid to prevent cryptocurrency-related promotions that may deceive investors.
Previously also the U.S. Securities and Exchange Commission has issued numerous warnings for their increasing effort in monitoring ICOs.
Source: https://www.coindesk.com/google-to-ban-cryptocurrency-ico-ads-from-june/