Someone is doing it

Investigation Finds Google ‘Blacklists’ Sites from Results

Google makes many claims about its search engine. The results are not curated, they are not manipulated, and there is no blacklist of sites, says

It may not be the official stance of Google to do this, but it is happening. So, someone with the clout to make it happen is making it happen. Figure out who it is and stop them before you are a footnote in Wikipedia.