I remember when I was a kid, there were lots of cars with signs, especially dukes, old crowns, and models.

I remember when I was a kid, there were a lot of cars with signs.
The Duke, the old crown, and a Mitsubishi car, forget what it’s called… Then Mercedes-Benz, Jaguar
In the early decades, countless European and American cars had their own standards.
Now it seems that only Mercedes-Benz and Rolls-Royce have kept their bid.
Why do you think people are slowly abandoning the bid?