I think you've got a couple of things wrong there. Kickstarter is in no way an investment as you don't get any ownership of the company/project and you don't receive any profits. You "pledge" money rather than "investing".
In the Kickstarter basics, they state explicitly: "Project creators kepp 100% ownership of their work, and Kickstarter cannot be used to offer equity, financial returns, or to solicit loans."
In section 4 of their terms-of-use, they state: "the creator must complete the project and fulfill each reward." There then follows a description of the appropriate actions for the creators to follow when it's impossible for them to fulfill the project.