The market in the states is huge compared to Canada that is vastly spread out with low levels of population density. Just the state of California alone trumps all of Canada. The markets are very different with customer bases and actual customers in an area. It's way cheaper for Cell companies to upgrade, maintain and offer (unlimited data) as competition. they are fighting in a huge markets to gain a share of customers.
Canada the networks are spread out to serve a lower number of customers and have a much higher cost to service those areas.
I can't speak to Bell or Rogers but Telus does not throttle. That is part of the premium prices you pay. You will get the same speeds and coverage for your entire data cycle no matter how much you use. Telus does have a fair usage policy and if you abusive it than you will be threatened with being disconnected off the network. However they do offer up to 60gb packages now so that no longer seems to be an issue. It's the smaller companies like freedom, fido etc that throttle because their networks cannot handle the over usage of high data users. Telus's network can.
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T-Mobile will potentially throttle you during network congestion after 50+ Gigabytes of data being used within a 30 day period.
In Canada, I would say it is less about population density and more about a lack of competition combined with corporate greed. The ridiculous minimum wages up here don't help, but even paying a higher cost for unlimited would be welcome. However, it is that lack of competition and corporate greed that will keep Canada's wireless industry far away from ever being fair to its customers.