There will be a new restricted financial products policy by Google.
In June 2018, Google will update the Financial services policy to restrict the advertisement of Contracts for Difference, rolling spot forex, and financial spread betting. In addition, ads for the following will no longer be allowed to serve:
Binary options and synonymous products
Cryptocurrencies and related content (including but not limited to initial coin offerings, cryptocurrency exchanges, cryptocurrency wallets, and cryptocurrency trading advice)
Ads for aggregators and affiliates for the following will no longer be allowed to serve:
- Contracts for Difference
- Rolling spot forex
- Financial spread betting
- Binary options and synonymous products
- Cryptocurrencies and related content
Sources:
https://support.google.com/adwordspolicy/answer/7648803?hl=en&ref_topic=29265
https://www.fxstreet.com/news/google-to-ban-ads-on-cryptocurrencies-related-products-rtrs-201803140550