There are numerous Canadian-produced shows on cable TV because Canada costs about 50% of shooting in the US. This makes the financials pen out for lower-budget shows that would otherwise die if made in the U.S.
Generally, the higher-budget shows are shot in the US. Largely, because the cast members on higher budget shows are less willing to move to Canada for half of the year. Compare, e.g., Suits and other USA shows (ironically, now all filmed in Canada) with Better Caul Saul/AMC shows or Mayans MC/FX shows (generally, filmed on location).
While I don’t disagree that many shows are made in Canada because it’s cheaper, the fact remains that the CRTC requires something like 30% “CanCon” in order to permit carriage (TV) or coverage (sat radio) in Canada.
Canadian-focused channels were a specific requirement for Sirius to sell radios in Canada. Before that, there were no Canadian channels, and people would import Sirius radios from border towns.
Generally, the higher-budget shows are shot in the US. Largely, because the cast members on higher budget shows are less willing to move to Canada for half of the year. Compare, e.g., Suits and other USA shows (ironically, now all filmed in Canada) with Better Caul Saul/AMC shows or Mayans MC/FX shows (generally, filmed on location).