Most FE guys do not fit a fuse as they are drawing currents well above standard fuse ratings and it introduces unwanted resistance, what they do fit though is a safety loop in the battery side of the circuit which can be pulled without untaping the hatch.
They also data log currents so their setups dont draw more than components can handle.
In my experience the fuse has not protected the ESC because its usually the ESC that faults as a dead short. The fuse only stops the fault current from continuing to flow, preventing further heat damage(fire) and battery damage.
Your brushed motor should draw less than 30 amps so standard Auto fuses can be used.
Nick