So warrant say "Uber should hand over data about transfers in/out from the companies bank account" and Uber can then hand them over a password protected CSV and say "You didn't ask for data you could read" and the police should just be like "Hah, you got us! We'll come back with another one!"?

no, you are missing my point. Im saying uber can encrypt all their data, decrypt what is asked for, and hand it over what was specifically asked for.

They don't have to hand over their entire database, and as a customer, I wouldn't want them to.

They don't have to let them grab whatever the want and root around in data not covered in the warrant.