Jakub Porzycki/NurPhoto via Getty ImagesRoblox's stock dropped 10% after short-seller Hindenburg accused it of inflating user numbers.Some of Hindenburg's previous reports have led to SEC investigations and indictments.But after the drop, Roblox's stock rebounded, with Wall Street focused on its growth potential.Roblox came under attack this week when a report from the prominent short-seller Hindenburg Research accused it of inflating user numbers and failing to protect children from predators.