That's a good question and hopefully I'll explain
The site is not intentionally or specifically accepting advertising from HCG products. The site uses "Google Adsense" ads which simply display ads based on keywords, at the discretion of Google - not 3FC or IB.
Unfortunately, Google does not allow a specific type of product to be blocked from advertising. However, it does allow domain blocking. What we do is when we see Google display an ad for an HCG product, we send the domain (listed under the ad) to our advertising manager and he enters it into the Google filter so that particular company is blocked from advertising through Google on this site again. We keep sending them, but unfortunately there are so many more HCG sellers out there in the Google ad system that they keep getting replaced. We don't give up though, and they will be thinned out.
The current ads you see will be removed Tuesday, after IB returns from holiday. Then whatever replaces them will be sent on.
If you ever see one that you want to report, please send me a PM and include the domain on the ad, not just the ad text.
I hope that helps!