Don’t worry, they will figure out that without humans releasing gasses they have no purpose, so they will cull most of the human population but keep just enough to justify their existence to manage it.
Although you don’t need AI to figure that one out. Just look at the relationships between the US intelligence and military and “terrorist groups”.
Also i would expect banks to use some sort of 2FA where you have to manually confirm any transaction on your mobile device, or enter a code generated from there into your computer.