In June of last year, Red Lobster announced that Ultimate Endless Shrimp — as much as you can scarf down for just $20 — would become an “all day, every day” fixture of the menu. Game on, said America. Diners swarmed the chain’s nearly 700 restaurants, ordering round after round of Parrot Isle Jumbo Coconut Shrimp (breaded, sweet and fried), Walt’s Favorite (breaded and fried), Garlic Shrimp Scampi (shrimp in a pool of butter and garlic sauce), Shrimp Linguini Alfredo (shrimp on a pile of pasta with garlic sauce) and Grilled Shrimp Skewers (self-explanatory). The first round came with two...