Interestingly, the Yandex bot was promoted through the official Telegram advertisement. It is reported that, according to TGStat, the bot’s ad was last seen on November 14 at 21:00.
Journalists also reported that not only the Yandex bot could have encountered fraudulent messages. The company said that the spam on Quiz Yandex Plus was published by the hosting company, where it is hosted. Yandex apologized to the affected users, but noted that user data was not affected.