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Yes, there have been cases of flashlight apps collecting and transmitting other data. Free apps like Flashlight can spy and steal personal data: Protect your smartphone with these tips : PERSONAL TECH : Tech Times

People need to think about what permissions an app requests when they install it; most apps I've seen ask for way more than they really need. Check out Hidden Android feature allows users to fine tune app permissions | ZDNet and Protecting Your Privacy: App Ops, Privacy Guard, and XPrivacy - XDA Forums