On the contrary, it's not even slightly difficult to believe that this is not deliberate because it happens all the time . Not everything has to be a mad conspiracy. It's roughly one billion times easier to believe that a bad automated flagging system has triggered and marked this particular link as spam, than it is to believe that someone at Facebook is twirling their moustache, stroking their long-haired white cat,…
Unlike Tumblr's NSFW filter, which is always correct /s
Read: ALL automated systems are bad, the whole AI thing is a joke, and will still be for a long time.