Um, it sounds more like the ACTRA is designed to get more American actors in and keep Canadian actors out. All you have to do is have an American company film in Canada and your in the club?
It's less about nationality than about budget; Canada actually has two different film industries; the American industry (with budgets measured in millions and billions) comes up here and films, hiring Canadian talent (in order to qualify for tax breaks, meaning that they have legally-mandated hiring quotas).
industry has budgets measured in the tens of dollars
, is usually run out of the director's basement, and films only on weekends, and is done as a hobby by people who rely on other jobs for a paycheque (my typical interviews go "What do you do?" "I'm a script supervisor." "No, I mean what do you do for a living?
"). In order to get money, Canadian producers have to go co-pro (most "Canadian" films/series that you hear about are actually Canada/France or Canada/South Africa or Canada/China co-productions).
ACTRA is designed to protect Canadian actors, ensuring that they get well paid for their work, unfortunately that means that most internal Canadian productions can't afford
to pay full ACTRA rates (or if they do, it means no-one else gets paid --most of the "work" I get is on the volunteer basis).