If the public loves it the restaurant has another source of new revenue. In the case of a new startup it could also be a featured recipe that helps them to get noticed to help get them off the ground and running overall. Believe it or not restaurants themselves can be considered one of the biggest copy cat artists out there but in a way that doesnt try to make an exact copy They will proceed in a way that may use the same name of the dish but pride themselves to make theirs stand out differently by adding their own signature touch and right down to what else may be included in addition to the entree to help set it apart from others.
It is also goes to show why restaurants are certainly a credible authority and why someone may go out of their way to imitate or copy a recipe or two. If you were to choose any one of your favorite restaurants or even one that may just be starting up this same basic description will apply. This restaurant will make a discovery of a new method or combination of sauces or seasonings for a new food recipe. I should say they work at making the discovery putting in time and effort initially so this new recipe could be tried and tested over and over until finally reaching the menu. The restaurant may advertise the new release to let the public know it has a great new recipe to come in and try out. Ideally it becomes a success and a featured item on their menu.
With the exception of serve your self style of service restaurants basically copy each other on the overall operating format of how the customers are served and taken care of right down to including "similar" items being listed on the menus. They all keep a watchful eye on each other to see what is working well and may change a menu method of service cost or whatever the case may be to accommodate current customers and coax new paying customers to spend money in their establishments. It is a constant see saw battle. Regardless of these restaurants copying and competing with each other for our dollars they clearly are the bar to which we compare the taste of our favorite foods to.