I'm not sure why you wouldn't spend money in a burger king as a vegetarian. They are one of the few burger chains that offers a vegetarian burger. If you ask for a veggie burger in Wendy's they'll give you a bun with lettuce and tomato. If you ask in a McDonald's they'll just laugh at you.
Don't get me wrong, Burger king is absolutely disgusting food no matter your dietary restrictions. But at least they try.
Also their advertising campaigns make me want to smash my TV, Alexa and computer.