KSI has officially left the Sidemen to fix his crumbling work-life balance and focus on his physical health, family, partner, and scaling solo ventures. While fans initially suspected another elaborate marketing stunt, the reality behind his departure is a sobering look at creator burnout after a decade at the top of internet culture. KSI Leaving Sidemen Explained KSI announced his permanent departure from the Sidemen on May 31, 2026, through a video titled “I’m leaving the S