It still implies some sort of meeting of the minds. You wouldn't say you've entered a "partnership" with the IRS because you paid your taxes, nor a "partnership" with the police because they pulled you over and searched your car.
You really do catch more flies with honey.
If there is 0 control over things, it's not a partnership.
At a guess, I would say this is more flagging to their real customers that their funds aren't safu...
Think about it... My fake example takes it to the extreme and portrays it as a serial killer sending a statement to the police department on how excited they are to help them find more of their victims' bodies. Obviously, it's not really a "partnership". Saying it's a partnership is just an attempt by the serial killer to reframe the situation in a way that implies civility and cooperative pursuit of mutual benefit. As if they are being employed by the police department. In reality, they are a serial killer withholding information in hopes of getting a chance at leniency. We are literally saying the same thing.