"Spoiler alert: You don't have to choose between fries and onion rings
ever again."
https://www.eatthis.com/burger-king-secrets/
I don't understand mentioning the BK Crown Card. Very few, if
any, readers will ever get one. As such, it's not really a secret
Burger King doesn't want people to know. Actually, I can't envision
any of the "secrets" being things Burger King wouldn't want people to
know.
--
Si hoc legere scis nimium eruditionis habes.