A few of the members in the community came out and documented how awful a lot of main site staff have been with very open and out there fetish pages, asking fans (which were primarily underage) for nudes, some were hyper obsessive with SCP and were willing to abuse others over it, a few were abusive to their own partners outside SCP. RPC, a splinter of SCP that sort of exists in it’s own ring, developed some gay ops around it and got some information, but it lead to some people being exposed and outed, and ultimately lead nowhere but here, where all the information already was. It’s died down but in response SCP made a grandfather policy where everyone underage before the policy was made is allowed to stay, but after, anyone under 18 isn’t allowed in and cannot write until they turn 18 to the day.
Tl;Dr site staff couldn’t keep it in their trousers, got called out for it, general community fumbling happened everywhere and a policy was put in place to prevent it generally in the near future. It was under a hashtag on YouTube SCPEDO, but that was primarily pushed by RPC.