These sites number in 100's of thousands. They are mostly on the "dark" web through browsers like Tor.
Yes people on the 4chans and other "anonymous" type sites will visit that type of site more often and I probably got and idea to launch from a comment about something I believe from voat. I think it was a link that got from voat and when was clicking around in the site I was taken to I found something that caused me to launch from there. I do a lot of research that I never post but can usually pull stuff up if I see a connection like I did this morning.
Thank you. You are quite a sophisticated researcher! Are you compiling or sending stuff you find to anyone who is working on the issue?