The only reason the 9442 had OTA was because it's a clone of a Dish receiver and Dish actively promoted and supported OTA. Dish provided an OTA guide and full integration with satellite signals, Bell never did. Part of that was due to Dish not having enough bandwidth for all the available US OTA signals that were available so it had to come up with another way to provide local signals. Fast forward a few years and Dish obtained enough bandwidth for adding local OTA on satellite (some of which they obtained from Bell) and were charging $10/mo for local signals. OTA tuners disappeared from subsequent receivers partly due to Dish no longer requiring them and partly due to Bell obtaining custom made receivers for Canada.
The lack of OTA tuner support by Bell (and Shaw) was also due to their business model. Their basic package was mostly OTA signals. They made most of their profit from selling OTA signals they provided on satellite. In most places where satellite dishes were used, there was very little OTA available anyway and no ATSC. Specialty channels were an add-on. The US satellite model was the exact opposite. Their basic packages consisted of all specialty cable channels with no OTA channels. They didn't even start adding OTA channels until ATSC became commonplace in most major US cities, up to a decade ahead of Canada.