I do most of my riding in very hilly terrain. I rarely see electric motorized vehicles except for the four wheeled variety.
On the MUPS? They are everywhere in SoCal on MUPS as well as gas powered off-road dirt bikes, electric scooters, electric unicycles, dune buggies, mini motorcycles and all matter of gas engine contraptions. MUPS are freeways for everything but bicycles in SoCal as far as I can see.