Actually it won't show any altcoins ads but only bitcoin related ads which are trustful also when you search something only trustworthy things related to bitcoin will appear
News reads :
BAD FOR SHILLS, GOOD FOR BITCOIN
Last year’s rapid rise in Bitcoin and other cryptocurrency prices was partially fueled by last year’s explosion in ICOs. Unfortunately, this nascent industry has also been rife with scams and fraud.
Ads promising too-good-to-be-true returns — such as the now-infamous Bitconnect with its memorable advertising blitz — have already led to many investors losing their money. This has resulted in repeated warnings from watchdogs such as the SEC, which considers most ICOs to be security offerings and thus subject to registering with the regulator.
Fortunately, the news does not have a direct impact on Bitcoin, the world’s first decentralized cryptocurrency. It is one of the few cryptocurrencies that has no marketing department, no centralized team and CEO, and is not registered as a company looking to raise funds.
There is only cryptocurrency that has never depended on marketing: Bitcoin.
All the rest would be nowhere without the marketing departments behind them.
It was purposely designed to be a decentralized, open-source protocol maintained by a disparate group of volunteer developers from all over the world.
Therefore, it doesn’t come as a surprise that the Bitcoin community largely reacted positively to the news.
“This is the best news ever. Only organic results when searching for Bitcoin!!” the top rated comment reads on Reddit.
News here : http://bitcoinist.com/google-ban-cryptocurrency-ads-bitcoin-not-affected/