Lots of uses
Depending on the area of the country, WVO is landfilled, processed and sold as animal feed additive, converted to biodiesel, burned in cargo ships with their bunker oil, or sold to cosmetics and soap companies.
The advantage this product has is that besides offering a cost savings, it reduces electrical/nat gas consumption, and it prevents the use of gasoline for the transportation of the WVO. If this device is even moderately efficient and clean burning, it is more sustainable use of the WVO than the alternatives.