>>157904254chan launched with an anime board and it was always that way. In fact it had many boards for anime culture as this is an anime website.
In 2012 m00t finally caved in to the millions of pony posters refusing to shut the hell up. They outnumbered everyone and they were the most insufferable of spammers. Most of the time their discussions involved trying to one up each other for the biggest faggot by having a pissing contest over who can devise the most deviant sexual act. The posts got out of control and m00t created
>>>/mlp/ to contain all the shit. It was created with purpose and the GR was set to prevent containment from being breached knowing what was behind the doors.
A cursory look into /mlp/ in 2022 has a fucking therapeutic spanking thread. That's the degeneracy and deviance being held in /mlp/.
I know this was way before your time but I was a chikun poster back in the day. I was one of the people the GR and /mlp/ was trying to contain but I fell off after I couldn't farm cheap butthurt (you)'s.
For a more recent example of the horrid nature of the /mlp/ board go on ahead and look into /mlpol/. Nobody enjoyed it and right when the pony posters found out they could post there garbage somewhere else they immediately went to flooding the board with it.
GR15 will never be removed because of what has already been done before you were even here.