While openai's use of Plaid's spying on bank accounts is framed as a service it's real use case will be identification. Very few people if any will sign up to use this voluntarily. But it is a way to get users used to Plaid's spying and start slowly boiling the frog.

The endgame I see is that it will be illegal to communicate on the internet without having a proven bank account. At least in the USA where all ID verification is settling on banks (ie, Plaid). And the banks will tolerate 10,000 false positive denials of service to avoid a single false negative and be happy about it. Plaid even more so. Human beings will have no recourse as they are private companies. This really should be a service that the states of the federal government provide. It's a dark future we're speeding towards.