Something must be done or their (kickstarter's) business may collapse. Banning renderings will probably cut down a bit on expectations not matching delivery, which presently is a problem. Quite a few projects seem to have underestimated the difficulties of quality control and mass production.
However, it is still pretty easy to get a nice milled or extruded aluminium block and call it a prototype so I don't think it will completely eliminate unscrupulous frauds.
Yeah but that "prototype" may not look nearly as amazing as a flashy 3D animation.
Is what kickstarter asking that unreasonable? (other than their lawyers probably told them do this now or suffer consequences that could mean no more business.) If someone can't produce a physical prototype of an item, do they really deserve hundreds of thousands or a million dollars?
However, it is still pretty easy to get a nice milled or extruded aluminium block and call it a prototype so I don't think it will completely eliminate unscrupulous frauds.