I'd still use IndieGogo, just not Paypal. The only alternative, however, is to use IndieGogo's own credit card processor, which charges 3%, but it might be worth it because funds are automatically ACH'd and you don't have to deal with Paypal... and the customer feedback is more direct.
But the big downside of this is that you don't get ANY of your money until the campaign is over (and up to 15 days after that), while with Paypal, you get your funds immediately (minus a 9% IndieGogo fee) if you elected for Flexible Funding. See http://support.indiegogo.com/entries/20578596 for more.
Given they only have two options: Credit Card from Indiegogo, which means no Paypal (yay), but also no money until the end (maybe boo) or Paypal (boo), but money right away (yay), it forces many folks to Paypal. They need to look at Stripe or Balanced or Braintree or something else.
That changes nothing. Indigogo has that policy to protect themselves from fraud. Any money they can't recover from a fraudulent project (or fraudulent charges because someone funded it using a stolen credit card, for example), comes straight out of Indiegogo's pocket. That's true whether they use a bank, Stripe, Braintree or anyone else.
This is exactly what PayPal was trying to control, and they got criticized for it.
At the end of the day, no payment processor wants to be on the hook for 100k+ that they get less than 1% of in profits, that goes to fund a project with no clear timetable, no guarantee of delivery to the customer, no budget, etc, etc, etc.
Someone could demand a refund because:
1) Their credit card was stolen and used to fund a project. They never agreed to the charge,they're entitled to a refund.
2) The project was fraudulent. The creators never intended to fund the project using the money. They ran off with it instead. Those people were deceived, and are entitled to a refund (in general, but also under the credit card associations rules).
Some potion of transaction on Indiegogo will be fraudulent. Paypal or Indiegogo must have a way of recovering that money.. if they don't then they will have to cover it themselves. That's the way it works. That's why payment processors create reserves for high-risk businesses.
With stories of fraud on Kickstarter, due diligence is your friend! So with Kickstarter (and IGG, I don't know their policy) taking 5% and no responsibility, users only have chargebacks as a course of action. I don't think it is the $25 donationsusers that care, what about the users who donate $2500?
http://www.polygon.com/gaming/2012/6/27/3099051/backers-righ...
http://www.dailydot.com/business/why-kickstarter-ripe-scams/
Your bank recoups that money from PayPal/indiegogos processor, and that processor will recoup the money from Indigogo, and indiegogo recoups it from the project. Whoever can't recover their money in that chain, is where it ends. That company is out of luck.
Saying, 'Oops.. we let one of our customers commit fraud, too bad for you'... isn't a permitted excuse.
And this applies to PayPal as well.. since consumers get their money into a PayPal account using a credit card or bank transfer. So PayPal is no different than any other processor in this case.
If it's a credit card, you might not pay your debt. That's a risk borne by Visa and MC.
If it turns out to be a stolen card, all parties on the receiving end might be obligated to return the money. If Mailpile is honest, they will comply, but if Mailpile is responsible for the fraudulent payment, they just successfully laundered some stolen credit into their bank account.
Maybe they can't get the whole $100k in cash, so it's not realistic since AML says they can't have more than 10k at a time. I would be very suspicious if I was mailpile's bank and they came in to close the account tomorrow. But, I don't think that's how AML works.
Nota Bene: PayPal also charges roundabout 3%. So the financial loss you're alleging doesn't exist, at least not in that magnitude.