R2N basically sell guests to the restaurants, to help them fill out the empty tables, and generate more revenue.
The R2N-concept is founded on the same principles as last-minute travel, where seats are sold at a reduced price when the day of departure is close by, to utilize the capacity.
With a R2N-booking the discount applies for both food and drinks. The discount depends on the day you book. The less time there is for the reservation, the more discount you will get. The discounts vary by the day and is determined by the restaurant owners.
With R2N do not worry about being treated differently than "regular" guests. With a R2N-booking, you have exactly the same freedom to choose what you want on the menu.