Do you have more details? The twist of only serving the inserted links to the Google Bot but not to normal users makes sense, but isn't an approach I've seen before.
I didn't look into it very much back then. They were giving free hosting and subdomains back when such a thing was expensive and jumped on it for my homepage. Somehow I saw the Google cache of my page and it was surrounded by ads.
So they were serving different content to different clients based on user agent and/or IP block.
When I found out I deleted my account.
I see the site still exists, they might do the same thing. It's 3x on the .ro TLD.
