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 really didn't know about this before

i do not know, it is hrd to say, i have never heard of this before as well and i am not sure how it will influence the future
unknown, but i do not think that we all should be afraifpd of this situation and i think that it is so hard to predict the futuree