Yes, I've noticed there are forums for most everything there is, legit or not. Some well known tech sites, that I won't list here, some of the membership likely knows of them anyway, where members openly list known working COA's & SLP's, all sorts of stuff. If something gets too far out of line, MS will complain & content is removed. No telling what's on the private section of these.
Here is the US last year, a forum was busted for swapping (or re-homing) adopted children, usually those with behavioral issues (likely not due to their fault). It was taken down.
I have no doubt there's similar ones on the teachings of hacking, the good ones becomes moderators & admins fast, I suppose. Problem is, the sites are likely in an area where no law of other countries can bust them or make arrests. That's the reason they're unstoppable. No law to bust them & if there are any, they're paid off to turn their heads (or face dire consequences). That's how criminals work.
A year or two ago, there was one in Australia, really had they not had a server in Virginia (I believe that was the state), the US couldn't have busted them. That one server on our soil gave the US the international right to make a bust & it was huge, Nearly a car lot full of expensive vehicles & other belongings. Nick, I'm sure you remember that one.
I don't know or remember all of the details, but part of it was the distribution of copyrighted and/or pirated software, games & movies.