LOL...I can guarantee you that it's not mandatory in several states, if not most of them. In fact, since a sway bar is part of your suspension, it's modification is, for lack of a better term, protected in Colorado at least. Back in the day, Colorado passed a law that made it illegal to modify a vehicles suspension...the law was repealed not long after as unconstitutional.

Seriously, though, I'd like to see a link for the law in Ontario that states you must have a front sway bar as I don't recall that being the case when I was living there.