Facebook said it will block all ads on its platform that involve digitally encrypted currency, including bitcoin, in an effort to discourage advertisers from promoting ads that the company calls "financial products and services often associated with misleading and deceptive promotion" .
I think Facebook has its own rules to protect users from digital money fraud or cryptocurrency. because not all Facebook users, especially those who advertise a coin, are deceiving. then Facebook must be more observant in deciding the ban.