Finally, it is a great news that Facebook now unbans Bitcoin & Cryptocurrency ads. I think they realized that not all ICOs scams they are many ICOs that legit and need to advertise on Facebook and it will give Facebook profit because of it.
I guess this is starting point of peak for cryptocurrency since Facebook is now lifting its ban. I think widespread of Bitcoin or cryptocurrency are unstoppable through Facebook advertisements.
One of the reasons could be that due to data leak many companies would have withdrawn the ads from FB as people also started opposing the FB. thus this means the revenue would have drop and thus in order to cater and get more revenue they might have unban crypto ads.