The ban on advertising of ICOs is a good move and it reflects only that FB wants to protect people from risky financial decisions. A lot of ICOs have merit, but a lot of them are risky at best, and well, some of them are scam all right.

On the other hand Facebook expressed that they will be researching blockchain and cryptocurrencies. I am even thinking that maybe the ban on ICO ads is one of the first results of that research. So I would think that they will be more into crypto with time. I wouldn't judge their approach to crypto based only on that one decision.