I don't understand this argument at all. Are we talking about customers leaving their information "lying around" or customers entrusting it to Netflix? I entrust my money to a bank: I give it to them. Customers entrust their transaction history to Netflix. Nobody is talking about customers leaking their private information to third parties, we are talking about the equivalent of the bank publishing the customer's driver's license information in a newspaper with their name obscured.
p.s. Now that I've established that I don't think this example is particularly relevant, I will share a story: Several years ago I returned from vacation to find a phone message from my bank. Someone had used what appeared to be my ATM card to withdraw $1,000 from my account while I was in Honduras. Of course I was the victim of some kind of skimming and cloning operation. The bank reimbursed me in full.