Маніпуляція "You were mentioned by the owner of a closed channel that publishes information without censorship, 18+, etc."
This is how readers are attracted to newly-formed telegram channels, writes the Spooner Project. The user seems to be exclusively invited to a closed channel, where "what cannot be shown on the main channel is published. In addition, the time of joining and the number of places in the channel are limited. In fact, it's just an ordinary subscription to a regular channel. Read more about Telegram manipulation