Well, whether it’s a bubble or not Facebook decided to play it safe and banned the ads of cryptocurrencies, including bitcoin, initial coin offerings (ICOs) and binary options across its network and partnering sites. (https://www.forexbrokerz.com/news/Facebook-bans-cryptocurrency-ICO-binary-options-ads
According to the new company policy, “ads that promote financial products and services that are frequently associated with misleading or deceptive promotional practices, such as binary options, initial coin offerings and cryptocurrency“ are prohibited. The ban will apply to all platforms of the company, including Facebook, Audience Network that places ads on third party apps, and Instagram.
There were a lot of scammers looking for gullible people on FB, I am not surprised they did this.