If you order an iced tea in Canada you are getting Nestea/Brisk like 95% of the time. Both are sweet teas, but are marketed and labelled as "Iced Tea", not "Sweet Tea" - ask our American beverage overlords Coke/Pepsi why

If you are in a cafe, or some other place where the expectation is that they brew their own, then yes, it's generally unsweetened - but it's also usually explicitly labelled as such on the menu so you know whether you are getting brewed tea vs a glass of corn syrup

Unsweetened for americans maybe

I'd like to propose a middle ground. As someone who puts effort into avoiding added sugars, it is much more difficult to find unsweetened tea at some chain restaurants or convenience stores.

Being from the North, I'm no authority on Sweet Tea, but I've heard that it's nearly saturated with sugar. If so, that's not what's usually available either.

I've encountered many a place selling sweetened tea (that may not qualify as proper Sweet Tea), but they didn't have unsweetened tea.