Ehn, see, this is the thing with Kickstarter. You have to word things carefully because your backers, your investors, the only reason you were able to make your project happen literally *are* entitled. And there's nothing wrong with that expectation IMO. Don't use the word 'full' even in the sense we typically understand it in the industry, because it certainly has a very arguable definition that ought to include everything.
Hopefully lessons will be learned.
On the other hand, some people were mad at the Shadowrun Kickstarter because
only backers were going to get the first DLC pack for free. But I digress.
But yeah, this was a dumb move by the Carmageddon guys. They should have at least waited until after release to talk about DLC if they weren't going to give it to the backers for free. Kickstarter success is all about goodwill, if you don't have goodwill then you're going nowhere. Bringing up DLC, especially after the game's been funded and before it's actually released, is going to upset the kind of people who fund games on Kickstarter,
especially when you tell them they're going to have to pony up extra money for it.