I'd be worried if Apple didn't remove apps with known exploits. Those apps run on a device that could have a list of your contacts, call history, and other personal data on it. On a handheld gaming system, that stuff doesn't exist.
But it runs on a device with an account that potentially has your credit card linked to it. It has an email address, and like 99% of the population, the same password as something else associated with that email. Handhelds aren't like the Gameboys of yesteryear.
Huh, interesting. I didn't know it had all that stuff. Thanks for the info.