I'm not sure exactly (must subscribe to get the full article), but I suspect that it has more to do with the Canadian content requirements. Canadian radio and TV stations must play a certain percentage of music and content produced by Canadians according to Canadian law. If the internet radio stations are not abiding by these requirements, then it would be an unfair advantage. The Canadian government has been very adamant over the years about protecting the Canadian identity. I have spent a lot of time in Canada over the years and it is very evident on Canadian radio and television.
Thanks for the kind words.....