Based on the findings here, because there were only six contracts that appeared to suit McKinsey, I have no reason to believe that this is unique to McKinsey & Company. I would expect to see similar behaviours for other professional services and other contracts in general.
When you add on the layer that we found issues with the rules being followed in nine out of 10 departments and agencies, and in eight out of 10 Crown corporations, that is a wide range, so it can't just be limited to McKinsey.