Moon.
@Satu Putra
Why would SFW filters be forbidden? Logically Furbooru wouldn’t offer custom SFW filters if they were forbidden for some weird reason.
The warning is worded the way it is because, like most websites, Furbooru reaches an international audience. Laws are different from region to region, so what may be legal to view in one country may be outright illegal in another. That clause is basically staring that its up to the user to determine if the content they choose to view through a custom filter is legal for them to do so. I believe the default SFW filter just tries to be as universally viewable as possible.