I absolutely believe that human trafficking goes on in the darker parts of the internet.
But you're not going to go to long into a mainstream website, on your Chrome browser, and use your credit card to buy an underage sex slave. You're going to use TOR, a VPN, go to a website that you didn't likely just stumble across and use some sort of crypto-currancy. 'cause you know, if you're going to do anything highly illegal... Well, you're going to want to minimize things.
I feel shit like that is created specifically to get the gullible to believe it and take attention away from real issues. I'm not going to pretend that the wealthy elite aren't sick fucks that want to r*pe children... But please, use some common sense.