Think about the company that has earned your undying loyalty. What is it about this business that resonates with you so strongly?
Do they provide a stellar product or service? Do they make it easy for you to purchase? Do they share your personal values? Is your experience with the company always positive and engaging? Do they express that they care about how you feel? Do they listen to what you have to say?
In short, you are loyal to this business because this business understands you.