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%.

Roblox Corp posted a bigger quarterly loss on Wednesday, hurt by higher expenses to support the expansion of its platform, sending shares down 12% in premarket trading.

Roblox Studio head Stefano Corazza has opened up about accusations of young developer exploitation on its platform, saying that the opportunity Roblox gives its teenage creators is “a gift.” ...