Baloney. The mainstream newsmedia are the mainstream newsmedia. Canadians are just as hungry for celebrity as Americans.
Maybe. But Canadians don’t regard their PM as celebrity (the one exception was Trudeau). Americans regard their president as celebrity; they are interested in each and every detail of the private life of the president.
Whether you agree or not, that is the big difference between USA and Canada (indeed, between USA and most countries). We leave the private life of our PM alone, Americans don’t leave the private life of their president alone, it is left to hang out, for everybody to see.