Originally Posted by AllYourBaseAreB

It didnt cost a lot of money

The C-Series was selling poorly and widely regarded as a commercial flop. Airbus became a partner for peanuts to act as a stability booster. Then Boeing being Boeing lobbied to get ridiculous import duties imposed after the Delta order. Bombardier practically gave away the operation because it was a money loser at the time and Airbus could move production to the USA to avoid import duties.