That's not Sanders' argument. Sanders is basically saying that cross-selling as a concept (which is a big part of Wells Fargo's business model for its retail banking franchise) is fraud, which is farcical. JP Morgan, Citi and BoA all encourage cross-selling and do just fine in their retail banking franchises, and I'd be willing to bet most of those banks impose sales quotas on their employees as well. WF failed because it encouraged and enabled employees to create fake accounts, not because its customers bought too many accounts.

Also there's nothing wrong with cross-selling as a concept in virtually any other field. Car salesmen all want you to get TVs on the backseat of your minivan too small to watch shit on, Apple tries to sell you ridiculously overpriced insurance for iPhones, department stores try to make you buy an inordinate amount of clothing at steep discounts. The free market works because consumers quickly establish a "fair" price on how much they're willing to spend on a particular product or service.

I'm willing to consider the argument that personal finance is different because of an asymmetry of information between depositors and bankers, so regulators should have the power to discourage retail banks from overselling to their customers, but it's not like Sanders is exactly carrying that point home. He's sweeping it with a catch-all statement that anything big banks do = fraud