Roblox says in its original complaint that PlayerAuctions disrupts and undercuts its business and economy by allowing players to buy and sell their accounts, items, and in-game currencies.

Players have spent more than $1.5 billion to date on the mobile version of online creation game Roblox.

Roblox shares slid more than 20% in early trading, as the gaming giant dialed back its forecasts for growth and first-quarter earnings showed player spending is slowing.