Many optimizers are not by hearsay know that it is worth a little to violate the conditions of paragraph 3.5 of the Yandex license and, according to the competitor’s first letter, the positions of the site will collapse below.
3.5. “Search spam” is an attempt to deceive the search engine and
manipulation of its results in order to overstate the position of sites
(pages) in search results. Sites containing search spam
can be lowered when ranking or excluded from Yandex search
due to the impossibility of their correct ranking.
It would seem that everything is correct - the relevance of search results is important, but you can’t violate a license if you are at least three times relevant and useful.
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But it was not there. For several years now, I have been observing an interesting picture: they live for themselves, get on with their lives, grief do not know two interesting sites:

Good sites, relevant to their needs, useful. But there are two "But."
The first "But":both sites have MINIMUM two almost identical pages each, sharpened for requests “Real Estate of Yekaterinburg”, “Real Estate in Yekaterinburg”, links to which are in the footer and which are actively interlinked between themselves within the site, sometimes twice on one page.
Footer links upn.ru
Links in the footer dolevka.ru
Text on the Ekaterinburg Real Estate page upn.ru
Text on the “Real Estate of Yekaterinburg” page dolevka.ruFind 10 differences? I did not find…
And between the next two pages
and the previous two:
The text on the page "Real Estate in Yekaterinburg» dolevka.ru
Text on the page "Real Estate in Yekaterinburg" upn.ruNot found again? Strange, yes?
The second "But":Both of these sites from these and other pages actively link to each other (see links listing the keywords below the text on these pages).
And what do we see? Sites were, are and will be in the TOP. Despite the fact that they fall under at least two types of sites that Yandex allegedly tries not to rank high, each:
- listing sites
search queries (multiple repetition and listing of key
words) intended solely to deceive the search engine and
manipulating the results of her work, including using
elements of pages that hide keywords, for example, by
scrolling or other techniques - single site groups
owner / company providing the user with the same products or
services created to fill multiple positions in the results
search and collect traffic - sites or groups of sites that link intensively
Each other