Here's what Google said:

https://support.google.com/adwordspolicy/answer/7648803

My first comment is that there's never been any BTC advertisement. Who would pay for it? The BTC's foundation? This board's webmaster? As there's no corporation, nor an individual owning BTC, there can't be any kind of advertising. The only ads I've ever seen were for lousy ICOs, shitcoins, trading and exchanges websites where you can make a deposit but not a withdrawal, trading consultants who screw you with the promise to show you how not to get screwed, and super safe crypto-wallets where your private keys are automatically sent to a smart angel in East Russia. Google wants to ban all that? I say thanks Google!