Do you agree that facebook banned all that promote ico's and bitcoin?
Yes, I totally agree with this, scammers are using facebook to promote their fraudulent website.
There is no need to generalize all the project as scams. Around 30% of the new ICOs seems to be scam, but the remaining 70% are genuine. And for them Facebook campaigns represent an important avenue to gain exposure and attract new users. Banning these campaigns may effect bounty hunters and promoters of the ICOs.