Please, and in all honesty and with zero trolling intentions, but please, could someone explain to me why the #NIXXXX hashtag is not banned? To be honest, that'

Please, and in all honesty and with zero trolling intentions, but please, could someone explain to me why the #NIXXXX hashtag is not banned? To be honest, that's the only thing I care to understand. I would really appreciate if you can educate me. Thank you.