Facebook ban on Crypto ads is a statement, a very loud one at that. Those ads were never effective to begin with, people rarely click them, nevertheless its quite surprising that Facebook would take such step.
If you ask me something that should've been done a long time ago. That facebook was full with spammers that advertise all sorts of ponzi schemes, doubling bitcoin scam sites, online mining, and many other things. They spam so much that you can`t follow anything if you have bitcoin related friends. And don`t forget that facebook earns money from advertising, why would they allow people to do that without paying them, and at the same time they are bothering other people with their spamming!? If new ico team wish to have an add on facebook they will need to pay for that directly to facebook.
The facebook is very good source of advertisements ,and there are many companies which are very interested in crypto ,but it is sad to say thst when an organization will rise up to its popularity like bitcoins and other cryptocurrency ,there are group of peoples who uses their knowledge trying to break or ride to bitcoin popularity through spamming ,scamming this is what happen to crypto ,ICOs ,bitcoins related ads being ban by facebook.