This might be a serious problem already, but people are generally unaware of it. Kickstarter does not make it easy to find failed projects. And almost everyone

This might be a serious problem already, but people are generally unaware of it. Kickstarter does not make it easy to find failed projects. And almost everyone who contributed to a project a year ago is likely enough to have forgotten about it by now. Even if they remember it, they have no way of rounding up all the other backers into an angry mob, except by posting on reddit or Hacker News.