If you do happen to wind up in a hospital, they "may" fly you home if it looks like it might be in for a longer stay - but you'll get the bill for the private medical flight. Trust me, if you haven't had a heart attack by then, you will when that bill comes in the mail. But you are basically 100% responsible for any medical costs abroad.
This must have changed somewhere along the line then.
About 30 years ago, a close friend of mine and his wife wanted to go camping at Wawa Provincial Park on the eastern shore of Lake Superior, and he called me to find out what he should do because his wife was pregnant and she delivered prematurely before. I told him that it would be best if he called Canadian Customs and find out for himself.
They told him that if she started in with premature labor they should go to the field office and that they would order a medical helicopter to fly he and his wife to Toronto. He asked what that would cost him, and the official asked if he had any insurance, and my friend said they did. The official said that they would bill his insurance company.
Out of curiosity, my friend then asked who would happen if he didn't have insurance, and the officer said that they (Canadian or provincial government-- I don't know which) would cover at least most of that bill.
So, something must have changed between then and now.