I am not sure how much vetting you want the platform to do? If someone says they can synthesize gasoline from air for $.02/liter, should Kickstarter shut it down? Send a guy to investigate? Where does the arbitrary this-is-probably-wrong line land?

Well that example wouldn't be allowed on Kickstarter, because they require a prototype to exist for electronics campaigns. I think that's a fairly reasonable arbitrarily chosen line.

I don't think Kickstarter "doesn't care", they just don't care enough to proactively find out. Indiegogo will keep outright scams up. Kickstarter says "eh, someone will flag it if it is a scam"