Can someone explain what 196 actually is?

I know it has something to todo with a individuals apartment number. I think it used to be 197 or 195 but it went private on reddit so they increased or decreased the number to end up with 196. I don’t know what the subject matter is supposed to be

196 has 1 rule. If u visit the sub, u must post something before u go

haha how is that enforced?