To Roblox's credit, they do take the "Club Penguin" approach: If you're under 13, you can only chat from a drop-down of chat options, and can only see messages

To Roblox's credit, they do take the "Club Penguin" approach: If you're under 13, you can only chat from a drop-down of chat options, and can only see messages sent using that functionality. Now, that doesn't stop kids from lying about their age when registering, but that's another can of worms.