... backers must understand that when they back a project, they’re helping to create something new — not ordering something that already exists. There may be changes or delays, and there’s a chance something could happen that prevents the creator from being able to finish the project as promised.
If a creator is unable to complete their project and fulfill rewards, they’ve failed to live up to the basic obligations of this agreement. To right this, they must make every reasonable effort to find another way of bringing the project to the best possible conclusion for backers.