The article doesn't explain how they made money, you need a relationship with SSPs and Exchanges to make requests and monetize the impression, even if you're just sending firing tracking pixels for creative view or complete, etc.
So how did these people make money? Are they for hire? Did they offer services to spoof the publisher domain and make revenue out of thin air, taking a cut from the pub?
So how did these people make money? Are they for hire? Did they offer services to spoof the publisher domain and make revenue out of thin air, taking a cut from the pub?