Ban – SEO WIKI
A ban is a control method in which a site is deliberately excluded from the search engine index, as it does not comply with the necessary rules. Another option – fortunately, the less common one – is a random release of a resource from the index due to errors in the search engine.
Under the ban may be sites that do not benefit visitors, containing duplicate content, pornography, materials that are contrary to law. The reason may be the promotion of the site using black methods – hidden text or links.
In order not to fall under the ban, first of all, you need to take care of your user, as well as avoid the prohibited methods of SEO-promotion. If you already have a ban, and you don’t know its reasons, you should clarify them by contacting the search engine support service. For known reasons, the factors that triggered the ban must be corrected, after which the site is sent for review. The answer from the search engine comes from a couple of days to a couple of weeks.