Facebook is not against Bitcoin but rather intends to avoid the situation of misleading its community members through its paid advertisement. Users of facebook can post crypto and Bitcoin related topics on facebook without any penalty.
I agree with this, in terms of secure public image Bitcoin is a very prone platform for anomalies and any technical related issues which may not be a good influence when it comes to public character for Facebook, which we all know is popular for very strict regulations which come up for a good flow of information and security is highly monitored, maybe it doesnt mean they dont really spread news about Bitcoin they against this.