Roblox stock collapsed after the online gaming and social platform missed estimates for users and bookings in the fourth quarter.

Roblox Corp (NYSE: RBLX) reported 19% YoY growth in Q1 bookings to $923.80M, beating analyst estimates. Adjusted EPS loss of $(0.43) also beat expectations. Stock dropped 28.3% premarket.

Roblox responded by banning his accounts and issuing a cease-and-desist notice, while safety officials emphasized that vigilante actions, though well-intentioned, create risks for users.

Roblox forecast annual bookings below estimates on Thursday, sparking fears that growth at the videogame platform was slowing after years of breakneck progress, sending its shares down 17%.