Facebook has issued an outright ban. As of a new ruling issued on January 30, “ads must not promote financial products and services that are frequently associated with misleading or deceptive promotional practices, such as binary options, initial coin offerings, or cryptocurrency”. The move is sure to be welcomed by Facebook users and bitcoin enthusiasts alike, who recognize that these adverts do little to promote the benefits of cryptocurrency.
https://web.facebook.com/policies/ads/prohibited_content/prohibited_financial_products_and_services
i think this is for advertisement they are creating a currency of their own maybe that is why they are doing it