Because they believe that Facebook prohibits bitcoin and ICos and other cryptocurrency
The new Facebook policy will not allow announcements of known digital currency exchanges or initial offers of currencies.
Is it to avoid fraud or false advertising? That's why?
I haven't caught that moment yet when Facebook has released its own cryptocurrency. In my mind the whole buss around crypto from the side of Facebook is just an attraction of users' attention.
after the ban on ico ads on their platform, Facebook formed a crypto currency division to see the potential, although ico has not been allowed to return, but coinbase can advertise again, this is proof that Facebook really opened its mind, but indeed if ico was left wild without regulation, it will have an impact on Facebook's reputation as an advertiser, this step is very appropriate while waiting for further developments.