A confidential TikTok document brought this exact issue into sharp focus. In late 2021, TikTok built an algorithmic safety patch to stop users from seeing endless videos about self-harm, suicide and depression. The document states: “TikTok’s filter bubble prevention strategies did not take effect on this user by design.” The wider dynamic shown here, balancing platform engagement against safety controls, is a challenge shared across the entire industry. This has been described as among the most damaging internal leaks in TikTok’s litigation history.