Another fud to bring the cryptocurencies down. I think we should see this as another attack and bitcoin price may come down because of the way many people on Facebook may interpret this. Bitcoin and blickchain technology can been used for scam but that doesn't mean any other forms of money can also be used for scam and fund raising. Facebook and Microsoft were in favor of bitcoin and other cryptocurencies before but lately there have started to attacked it for the reason best known to them.
Definitely Yes I agree with you. Not all cryptocurrency ads are ban in the Facebook. They only ban this to protect scammers. Facebook has banned some advertising for cryptocurrencies because they are frequently associated with misleading or deceptive promotional practices. Facebook management protects only their page from scammers and wrong information that is advertised at their page. But they don't totally ban cryptocurrencies. They support it the program.