In a word ---- marketing.

For the same reason people currently buy "American" autos (and planes) built from parts sourced around the world.

In American management culture, marketing is the knee jerk solution to any problem and the holy grail from which all revenue is gifted. They are true believers in the "magic" of being able to "game" people into making decisions based on something other than logic.

This same culture explains how/why the internet we have today is built around privacy invasion and (wait for it) ... marketing.