Yeah this is dumb. No way are they going to be able to enforce it
I think it may have less to do with enforcing but more with the 3 L's. So if something bad happens like some Quadtard pinning it down some logging road around blind corners and visually inspects say Tacklebox's grill work. The province can say that they did something and are not responsible.
But from what I understand they already do this plate thing in Saskatchewan and Ontario. And from what I have seen and heard here it's the areas close to urban centers where the majority of the focus will be. Rural areas will unless someone is acting like a Jack Ass be pretty much ignored.