The Burger Den

So this is a ghost kitchen that operates out of Denny's, which is fine, Denny's is fine. Fine is the operative word though, there is a reason that all the reviews are a 3, because everything is just fine. When I typed vegetarian food near me, it said 0 results. So I picked this because they have veggie burger which was what I wanted, and the website was giving me a hard time putting in my order so I had to put in through doordash. So, they gave me a 5:55pm pick up time, I got there at 5:42 and my food was already cold...I still ate it though ‍. As for the restaurant itself, I was only there long enough to pick up my food, and the building looked old and it seemed dark inside, but it seemed clean enough, so...it was really just the definition of "fine".

Why is this a thing. It's just Denny's. Same address same burger. I have a hard time with restaurants changing the name but serving the same or part of the menu under a different name