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.

Meme Sea lets you explore a meme-filled Roblox world and requires you to become stronger. One of the main ways to attain better powers and weapons in the game is to eliminate raid bosses.

Louisiana sued the online gaming platform Roblox on Thursday, alleging the wildly popular site has perpetuated an environment where sexual predators “thrive, unite, hunt and victimize kids.” ...