why wouldn't it? its just a public records search like the thousands of other websites just out there just like it
Probably isn't a site where you don't have to pay since the state itself tends to charge to access the information. There's certainly not one I know of, though there is some other information listed as available on that site that you can find on the web for free. Just not license plate info, to my knowledge.
I remember a long time ago something like this working...I don't recall the exact one, but if you're stalking, why publicize it...Keep it on the DL...