That's the definition of judging a book by its cover. Maybe they don't care about spending money on design and just want to focus on the food they serve, you'll never know. I would also probably be less inclined to enter a restaurant if I saw generated images advertising the food as opposed to real ones. But I would never ever dare put a one star review without even having been a customer there in the first place. I would remove 2 stars at most from a 5 stars review, if the food and service was impeccable but they ruined the settings with AI.