SCG has two telegram announcement groups, one for general group announcements, and one for game service announcements.
This is the SCG Announcement channel, where SCG news posts / events are shared here.
The SCG Service channel is meant for sending announcements about active games. A game is considered active when it has reached a threshold of players active and is no longer considered active when it hits a different threshold. The thresholds are unique to each server. To avoid spam, the telegram message is deleted when the game is no longer active, unlike Discord where a game is over message is displayed instead.
The credit for this idea goes to Weese, who suggested it to me!