I once got banned from a FNAF RP for no reason because the host thought I was a troll. The reason went like "*sees foxy run down hall* NOPENOPENOPENOPE And that's what I say to you troll"
Based on the quality of FNAF RPs, these servers are run by autistic 10 year-old who have never played the game and/or watched their favorite YouTube play it and recreate it.
I did visit one FNAF server (Chica the Chicken's Friendly Family and FNAF RP"), and it was really, REALLY cringe-worthy.