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I'll add one that was especially common for people coming off the year of free tier a couple years ago. I'm not sure that AWS has changed it yet.

6. Not starting a box/instance/database and forgetting it's running until you receive the bill after your free tier expires.

I expected to see something like this generalized in the article as

6. Not setting up billing alarms, http://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/...

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