yes...But right now the resterants must pay to have it hauled away,
So whomever is currently "recycling" it is reaping an economic benefit that the marketplace has yet to fully address.
Like all things, the marketplace will eventually come back into balance, and the current "recycler's" will be forced to either remove the stuff for free or even pay for the privelage of recycling.
The best way for that to happen is for private industry to set-up a network of used-ccoking oil recycling centers.