To accept your statement that I'm "wrong," I'd need to see some examples of false business fronts that were not obviously bogus from day 1.

On eBay, yes, it was pretty easy to play the "Sell a bunch of stuff for 99 cents and then pull the big scam" game. But none of the widely-publicized cases where PayPal has basically attempted to wreck the lives of startup founders fall into that pattern. These people have all had independent web sites selling actual products, and/or a background in other ventures that could be checked if PayPal were to spend 5 minutes doing due diligence on them.