Hi Piotr:
I agree with you when you say that you are not paying much attention to this legal battle of Facebook and FATF. Practically people do not care.
If they wanted to use this theme as part of their advertising campaign then they failed in the attempt.
Regarding the number of FB users. It seems to me that this is the true value they possess and is their "ace up their sleeve."
Although I would instead have started an aggressive campaign of cryptography education taking advantage of the immense level of projection it has.
Your friend, Juan.