I still see ads on facebook and google, maybe it is because they will continue publishing crypto ads which they received payment for.
After that, they will close all incoming payments from crypto advertisers and will permanently close this ad option for crypto advertisers or maybe they already stopped it.

Maybe next few months we will see more crypto ads on those platforms.


edit: I forgot to mention my opinion. Crypto advertisers will focus on crypto related sites such as News, blog etc to promote their ICOs.