[Tip] Avoiding to give away credit card information to use Kindle Fire

Q: When I try to buy a apps, even free ones, my Kindle Fire requests to register a credit card information.

A: Give it away or give up apps :) Just kidding.
A blogger recommends to use dummy credit card information like followed by link.
http://www.dragonblogger.com/setup-kindle-fire-kids/


I don't like this behave of Kindle Fire.