When I was an Eastlink customer in Timmins, we always had caps on bandwidth except for the 20Mb package regardless if it was bundled or not. It was 250GB/month. According to their page, none of that has changed for ON yet.
We also had a lower upload speed for the 40mb service. Apparently 1s and 0s are more expensive in Ontario.
$10 extra a month max is pretty darn good really. Better than getting a bill with a $200 overage charge, as an example.