"Tied selling" refers to a practice where a seller forces a buyer to purchase one product or service only if they also buy another unrelated product or service. It's like a condition or requirement for getting the desired item. Full definition
While it's at it, the regulator should probably look into what looks like a clear case of tied selling. (canadianbusiness.com)
We urge you to let us know if you believe that you have experienced coercive tied selling in any dealings with us. (pnc.com)
The Canadian government has purposely done this to encourage competition in the insurance industry (primarily to ensure low premiums) as well as to avoid tied selling (needing to buy insurance in order to get approved for a mortgage). (moneysense.ca)