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Google banned advertisements such as Bitcoin other crypto's since March 2018.
According to TechRadar, google policies were updated in "financial products and services". It goes without saying that it has become possible to display advertisements in the US and Japan since October. There is no problem from anywhere in the world, but only two countries in the US and Japan are mentioned.
Measures in March to prevent damage such as fraud and potential harm to users. For example, even in the initial coin offering (ICO), exchanges, digital wallets, and trusted traders, those concerned have forbidden to promote the service using Google AdWords uniformly. According to Google, "It is aimed at protecting users from harmful or fraudulent commercial laws."
However, in order to published advertisements related to cryptocurrency, it is necessary to obtain approval in that country. It seems that the advertiser will submit an application for approval after the policy at Google is enforced.
