This will affect all of Google's ad products, meaning companies will not be able to serve crypto-related ads on the search engine giant’s own sites, as well as third-party sites in its network.
Just after a month of Facebook announcing that it would enforce a similar policy that bans advertisements involving bitcoin and initial coin offerings to prevent cryptocurrency related promotions that might deliberately misguide investors, google has decided to update its financial product policy.
Google's official blog : https://support.google.com/adwordspolicy/answer/7648803?hl=en&ref_topic=29265
But do they really want that to happen, because this market still gives them a lot of $.