Officials in Florida and New Jersey are scrutinizing popular video game apps Roblox and Discord over child safety concerns.

Do you let your kids play Roblox? Many, many parents do. The gaming platform has a huge audience — some 85 million people visit it daily — and about 40% of them are under the age of 13.

These growing concerns over child safety are part of why Roblox has been rolling out a series of updates with new protections for its youngest and most vulnerable users, including age gates ...