I wouldn't panic yet. It doesn't say anywhere in the T&C on the signup page that you need to remain an active subscriber for 6 months so I wouldn't assume that's what they are going to do just based on what some CSR's said. Worst case scenario, they don't give you the gift card and you contact AMEX for a chargeback.
Now for Dan to post it on the main site, where most of the people can't even read the post, forget about actually dealing with it if something goes wrong (other then coming back to complain to Dan for stealing their money
) that's a different story.