That might have been why it was created, but it's not how it's primarily used today, nor do I think it does that good a job combating "customer confusion". (Remember, even without Ubuntu calling their OS "Windows", Dell customers still sent back Ubuntu laptops complaining they thought they were getting Windows.) Just like copyrights and patents were created to encourage innovators to innovate and share with society--the goal was improving society--that original purpose is lost in the primary uses of IP laws today.