Many parents unknowingly leave their credit cards linked on their phones, tablets, or PCs (or a Roblox account) with all the login data saved without thinking anything bad could happen.

While a parent's actual credit card may be linked, within the world of the game, kids spend only fictional currencies - like V-Bucks in "Fortnite," or Robux in Roblox.

How to keep your kid’s Roblox or ‘Fortnite’ habit from wrecking your credit-card bill It’s too easy for young gamers to see digital payments as ‘free money.’ Here are some tips for ...