TikTok Now encourages all TikTok users to share a post at an exact time at some point every day. Users will receive a TikTok Now push notification from the application at a random time each day, and they’re encouraged to share a post within three minutes of receiving it.
https://www.adweek.com/media/tiktok-how-to-turn-off-daily-tiktok-now-push-notifications/