From Yandex site fell leading SEO company Runet

Yesterday an unpleasant event occurred for one of the leaders of the search engine optimization market - the company of RBS Corporation. The www.bdbd.ru site dropped out of Yandex at key company requests.
For the past two years, www.bdbd.ru has been the undisputed leader in the “search engine optimization” category on seorate.ru . The company is considered to be the market leader and has enormous prestige among optimizers. But this time, the authority and popularity played by BDBD is not at hand. The fallout and its causes were immediately a reason for discussion in all forums and blogs that are at least somehow related to SEO ( Yandex blogs on BDBD ). But what is the reason for this situation? As much as this would not be desirable to ill-wishers, but the BDBD website was not banned by Yandex, but simply pessimized, and this punishment from heaven most likely doesn’t touch BDBD clients. And the reason may be just in the blogs. The site yesterday late at night (which proves how important the lost positions were for BDBD) was the following information :
In the previous update of Yandex, a large number of resources were indexed with texts that were stolen from us and placed in order to lower our website in the results of the issue.
I, like many with skepticism, reacted to this statement. It looks a little convincing - can several sites on the people be able to sink even such a giant? But if we take into account the recent changes in the Yandex algorithm with strict filtering of duplicate content, then perhaps BDBD is just the beginning.