Kickstarter handle the funding end of things. When a project is funded they did their bit. People contributing know they are getting promises that may not turn out. They're not buying stuff. They are getting enjoyment out of being a part of something. Celebrating when a project succeeds. Getting disappointed when it doesn't.
Maybe the hype will end and this'll all blow over. Maybe Kickstarter is here to stay. Either way, it's obviously not malicious.
I point this out because I want Kickstarter to succeed in the long term. If they don't create a way to discourage projects that ultimately fail, adverse selection could become a real problem.
Of course, this isn't unprecedented at all. At first, eBay was just a place where you put in a credit card and maybe got something delivered to you, or maybe it didn't. Then people started expecting sellers to accept this new thing called "PayPal."