Well, to be fair, there's an associated fantasy, and the sub is, last I heard about them, a satire, and not really a sub about raping women. I haven't checked though, so it's all hearsay.
Look up "consentual non consent" Rape fantasy is a big thing... but it's also a fantasy
I don't think anyone on that subreddit was actually promoting raping women ( of course, only women can be raped /s ) It was either them being sarcastic or talking in a BDSM context.
It was not a rape fantasy sub, it was a rape philosophy sub. They had posts about advice for getting away with rape. It may have been labeled satire, but the damage it could cause is exactly the same as if it was labeled serious, if not more, in my opinion. It's like if I were to create a website in order to rank killing sprees and made it out be be a competition site and then said it was "just a joke". It doesn't make it not dangerous.
I'm kinda saddened that's a thing