Agreed. IGG does not care, at least that is my perception based on my interactions with their "support" staff. Basically report a shady project, and you'll get a form like letter response. Keep pressing, you get told they'll pass on your comments to their fraud department, and they would contact you IF they have more questions-- you never hear back again.
As an example: I reported a project that violated the first law of thermodynamics, and basically told them so... the response I got was the following [I didn't keep pressing on this one, as it obviously wasn't going anywhere]
"Indiegogo empowers campaign owners and contributors to raise money for, or support, the things that matter to them. Because Indiegogo is an equal opportunity platform, a wide variety of subject matter and opinions may be expressed through campaigns. Because we do not curate these campaigns, the views reflected by campaign owners are not necessarily those of Indiegogo."
I wasn't aware that the laws of thermodynamics were a matter of "opinion".
My take is that they think they can provide a platform, and by turning a blind eye they are free and clear. I'd like to see what happens when it inevitably ends up in court... that position didn't play well for Napster back in the day.