It seems recycling grease is profitable enough that it's offered as a free service to restaurants. See, e.g., > > What does it cost me to be a DAR PRO Solution

It seems recycling grease is profitable enough that it's offered as a free service to restaurants. See, e.g., > > What does it cost me to be a DAR PRO Solutions customer? > In most cases, there is no signup or administrative fee for becoming a DAR PRO customer, though depending on market conditions, store location or other special circumstances, there may be a small delivery fee. This would be disclosed prior to finalizing any agreement. Normally, we provide the oil storage equipment and grease pick up at no charge to our customers under normal yellow grease market and operational conditions. Source: https://www.darpro-solutions.com/about-dar-pro-solutions/faqs-dar-pro-solutions https://www.darpro-solutions.com/about-dar-pro-solutions/faq... I wouldn't be surprised if a large company like McDonalds is able to recoup some of their costs by selling grease. Alternatively, even if the service is a net cost, as with residential recycling the service fee might offset by what the recycler can make from the waste, and so the recycler might require measures to safeguard their supply. Also, you might not want strangers rummaging through your bins as some of them might make a mess.