YouTuber RealSchlep, known for exposing alleged child predators within the game Roblox, says the platform has banned his account and sent him a cease-and-desist letter threatening legal action.

Schlep, a YouTuber who built his online following by hunting alleged “predators” inside Roblox, is now in the headlines for a very different reason.

A YouTuber who claims to hunt and expose predators in Roblox was banned earlier this month, and some parts of the community ...