Despite the histrionics of this article, its actually an interesting question from a legal perspective. In the case of an account the customer never agreed to open - are they bound by the agreement which opened their primary account, or is there no legal agreement in place? Assuming the original arbitration clause covered the entire business relationship - not just matters specific to the account opened at signing th…
How is it "histrionics"? "are they bound by the agreement which opened their primary account, or is there no legal agreement in place?" How can you be bound by things you never agreed to? "We signed you up for more services, but because you said yes once that means you are always ours."
Wells Fargo didn't open accounts for random people; they opened accounts for their customers. Who agreed to resolve future disputes via binding arbitration. And one of those future disputes is over the fake accounts Wells Fargo opened later.
Whatever you think of arbitration agreements, it would make no sense to have one which terminated the moment you have a dispute.