That might explain part of the cause of ground looping on take-off, but a lot of them occur on landing, and typically, power is pulled way back, so gyroscopic precession should be minimal then. Loss of sufficient airspeed for the rudder to be effective, or riding the brakes unevenly (full scale) can induce a ground loop on landing, by starting a yaw that gets too severe for the tailwheel or rudder to straighten out.