If you scroll to the bottom of the page on a search query, you'll see a link called "feedback" by settings and help. Submit your report there. I saw an adverti

If you scroll to the bottom of the page on a search query, you'll see a link called "feedback" by settings and help. Submit your report there. I saw an advertisement for counterfeit currency on Google one time. The scammers weren't even trying to hide it or disguise it as collector money or anything. It verbatim said counterfeit money for sale. It linked to some Weebly page selling fake bills at a discount to face value. I took a screenshot and reported it using the feedback form and someone got in touch with me in about 5 hours and they thanked me and said they took it down.