I guess they don't really enforce it. Zenmoney reverse-engineered APIs of banking apps and their app is still on both app store and google play
IANAL but I also wonder if app A can violate app B's terms of service, if they never agreed to the TOS in the first place.
IANAL but I also wonder if app A can violate app B's terms of service, if they never agreed to the TOS in the first place.