Earlier quoted context omitted.
So why do they actually do business with IndieGoGo? I would expect the vast majority of IGG campaigns not to be able to deliver within 20 business days. Since the users of IGG obviously intend to use the money to fund a lengthy process of building a product that sort of invalidates the use-case.
Presumably they've done the kind of review of IndieGoGo's business that they stated they'd like to do of Mailpile and found that IndieGoGo has their risk spread broadly enough (and has a cash buffer large enough) to underwrite the risk of a particular project going down.
a) either Paypal/IGG can afford the risk
or
b) issues like this will crop up again and again and again, leaving frustrated businesses and a bad impression behind, regardless of who's technically to blame.
or c) I'm missing some point here.
The other thing I'm desperately trying to understand is why PayPal claims that the refund risk is high. Almost all benefits given by the IGG campaign are intangible or of neglectable value compared to the funding you give. The first tangible item starts at the 67USD tier (a postcard from iceland [!]). Later items include a T-Shirt for 256 USD and some overpriced USB-sticks. If someone at PP actually read through the descriptions, it would be pretty obvious that any backer was aware of what he's doing.