I’m aware that there are “Canadian Warmbloods,” just like there are “American Warmbloods,” which is to say a bunch of crossbreds, at least half of whom are Appendix Quarter Horses being “rebranded” for the English crowd. Plenty of PMU babies were registered as either - again, branding. As far as I’m aware there are still PMU mares in Canada, just less. Where I live, the same trainers still get horses with the same “look,” just like they have for the last twenty years. They are described as “from a Canadian breeder” and many successfully go out to the hunt field with their weekend warrior riders.
I don’t see why PMU foals would go to rescues? Once upon a time, sure. But now they’ve figured out how to breed very classy looking draft crosses who bring 5 digits in the United States at 2-4 years old. They’re money makers for a lot of these breeders.