[2016]. Having worked at Google’s Search Quality Evaluation team, I can confirm that Google would only manually remove sites from its search results if they violate its webmaster guidelines: https://support.google.com/webmasters/answer/35769?hl=en Of course, there can be other issues preventing a site from showing up in the search results (e.g. site migration issues, accidentally locking out Googlebot in robots.txt,…
This is something notorious and traversal to all its products.