Kickstarter's founders are getting worried about what people think -- and in particular that the crowdfunding platform will be perceived as an Amazon for uninvented gadgets. As such, they're tightening the rules on product pitches to prevent anything too nebulous getting through the vetting process. Projects using simulations or renderings are prohibited from today, forcing creators to demonstrate working prototypes of their inventions. The site is also adding a section called "Risks and Challenges," where contributors have to demonstrate
