Taco Bell is owned by a corporation called Yum Brands. They also own Burger King, A&W, and KFC, among others.
Faulting Taco Bell for not being authentic Mexican is a bit stupid. It's fast food, they could not have built up as big as they are selling food with a limited audience.
Just like KFC isn't what you make at home and your burgers don't taste like McDonald's, doesn't mean they are doing something wrong.