What made Medic's Slender Fortress server popular?

Back at September 2017, Medic has released his Slender Fortress server. His server is less popular that only 5-8 players joined his server, less bosses and less maps were active during that time.

At October 20, 2017 MarioPlayz Gamez released a video with the title Slender Fortress | Deathclaw. It was his second Slender Fortress video next to the Rake. At that time, there was exactly five players on the server, one left the server. The remaining players are four. The four players are MarioPlayz Gamez himself, Durries, Soul, KBM KiemBoom, and an unknown player that left. They might '''be the oldest players in the server. '''However, there is no proof how the server became popular. When Mario released his Slenderman video featuring Its Ya Boi Jack on the current map The Ward, there was 15+ players on the server. Still, it is unknown how the server became popular. Mario released the video way before he released this wiki. Mario didn't say anything in the description that he shared the server, but the YouTube video itself has 150+ views. Mario thought that maybe the views that lead the players into the server. But he still thinks about the three other players in the server, KBM KiemBoom, Durries and Soul. The three might've been the ones who shared the server to go play on it, which cause Medic's Slender Fortress server becoming popular.

However, Mario has 2 non-Medic servers that he uploaded, The Rake and Error and Tiny Error. The server where he uploaded the Rake vid was from Disc-FF, while he uploaded the Error's from Glubbable's server. Mario played the server back on October 14 2017. It was not his first server, tho. His first server was BlackWonder. But it is still unknown why the server became popular, the group already had 20K+ members before Mario uploaded the vid, but the server back in October had less players. His first video, The Rake does not proof that his viewers on that video made his viewers interested, because the name of the server, Disc-FF is at the bottom left. There is only 1 proof what made it popular, the three older players along with Mario himself. KBM was completely silent in the chat in the video, while Soul was spamming "I look at you in the room", while Durries typed in chat at the near-beggining of the video where he said that he had a nickname for Deathclaw, Rapeclaw.

This doesn't stop why it's so popular. It will be a mystery.