DRP network shops are collision repair facilities that your insurance company collaborates with to keep their costs down. The collision repair shop must meet insurance company mandated service levels and terms if they are to remain in the DRP network. Some of those requirements will benefit YOU but most will benefit the insurance company. Collision repair shops suffer from overcapacity so they tolerate the Direct Repair Programs as a source of business.
Your insurance company cannot require you to use a DRP shop (this is called "steering" and it is illegal) - however they will strongly encourage you to use one by making it easier. Your claims adjuster will ask if you want to use one of their network shops. If you decline, be prepared because the insurance carrier may issue a check on the spot for the estimate total less your deductible. Using a DRP shop is administratively easier in most cases. If your vehicle is not drivable, chances are the insurance carrier has it at a DRP shop or will have it moved to a DRP shop with your approval, at no added expense to you. The only out of pocket with the DRP is your deductible which is payable to the repair shop when your vehicle is returned to you upon completion of repairs.