You know they are gonna list the DST on the game purchase as well right? I don't know the qualification for this or is there a cut off in revenue generated in Canada. But service tax, like sales tax, either by subscription or contractual(like cloud service, digital platform, etc) there are no Canadian owned version(that's big and stable enough), so you ended up need to buy those and they can just slap that 3% on the price tag.
Of course the US doesn't like it. Their country is getting all the benefit of US corporations basically running the internet without contributing to the societies they are leaching money from.