Roblox is no longer allowing users under the age of 13 to message others outside of games and experiences on the platform.

It is the latest target of Hindenburg, whose reports have knocked shares of companies owned by billionaire-investor Carl Icahn and India’s Gautam Adani.

Roblox ’s chief executive is facing a wave of fury after his company sent a cease and desist letter to a YouTuber known for exposing alleged child predators on the online gaming platform.