Kickstarter (the company) does a decent job of filtering out obviously scammy projects. At this point I think a human being still looks at each and every project as just a sanity check (I know they also offer suggestions on how best to structure your project, etc.).
The much larger gray area has been in cases where it's: "Hey contribute $100 and get this awesome gadget in a month!" that have failed to deliver anything.
Most of those cases have at least seemed to be good intentioned failures where the project owners didn't anticipate just how difficult it is to manufacture and ship products or they were just wildly naive in their estimates, but again it is impossible to tell.
To date, these haven't seemed to have made an appreciable dent in the amount of crowd sourced funding happening.
The much larger gray area has been in cases where it's: "Hey contribute $100 and get this awesome gadget in a month!" that have failed to deliver anything.
Most of those cases have at least seemed to be good intentioned failures where the project owners didn't anticipate just how difficult it is to manufacture and ship products or they were just wildly naive in their estimates, but again it is impossible to tell.
To date, these haven't seemed to have made an appreciable dent in the amount of crowd sourced funding happening.