What do you even mean by "dark web"? Stuff like this definitely doesn't exist on the onionland.
A good blog post would be a detailed tour of this site and going through the process of buying a slave and then interviewing them about their experience, afterward I guess you could let the slave go off and do whatever they wish or perhaps resell them to get your money back since you are unable to take care of them anyway.
Not sites?
One thing I know about the internet, is that there isn't just one of anything, even if it's illegal.
I'm fascinated because I track things like this for a living, but have never heard of anything similar to what was described here.
Modern slavery certainly happens - but I've never seen it on silkroad-style websites.
A post by someone online, who once talked to someone who said you could buy slaves online ain't exactly first-hand evidence - Perhaps someone was mistaken, or taken in by darknet scam artists.
not gunna link for my own safety but theres links to it all over pedo sites
im a greyhat who tries to take these sites down so i seen some shit
If they find some idiot willing to send them money to "buy a child sex slave" they will just perpetually extort them with that.
Only places where these sorts of markets can actually work are places like Syria where they're backed by some sort of local authorities like IS.