Interactive

While auto manufacturers may not have video introductions on their websites, many have entered into the interactive world through various other promotional methods. However, as with anything else there is a certain amount of risk involved. Chevy’s now infamous a foray into the world of user-generated content with the Tahoe Build your own commercial is a perfect example of these risks.
Conversely, Pontiac has had a great deal of success with innovative interactive campaigns, such as the recent ‘Catch a G6’ mobile marketing campaign, and the appearance of the Solstice on The Apprentice (and the subsequent spike in web traffic).

While I am not aware of the specifics of this particular contest, many similar promotions indicate that the promotional period lasts until the end date OR until quantities last. My guess would be Coke simply ran out of materials.