Just read about Yandex.News which display censored news sources on Yandex frontpage that millions of people visit. There is really no hidden censorship here - they just follow Russian law that literally whitelist exclusively press controlled by the state.
They show Kremlin propoganda on their front page which makes Yandex part of Kremlin propoganda machine. They could have shut down news agregator, but they choose not to.
They are complying with russian censorship laws and it's gotten so bad that they are planning to sell the news service altogether to VK which is far worse than Yandex when it to how eager they are to enforce these laws and to work with cops.
They show Kremlin propoganda on their front page which makes Yandex part of Kremlin propoganda machine. They could have shut down news agregator, but they choose not to.