A research firm shorts Roblox because the game company is allegedly misleading investors, lying about user numbers, and facilitating illicit behavior with minors. Roblox denies the accusations.

Roblox Corp. is testing a short-form video app similar to TikTok that will allow users to capture and share 30-second clips of their video-game play. Roblox Moments, as the new app is called, will be ...