In the ‘70’s when I worked for a driver, you could tell Chevy from Ford, Ford from Plymouth...Plymouth from Dodge...
Now they all look the same....
For a while, weren’t they all really the same car with different badges and grilles?
Did a quick Google - looks like they still do - they are all built on the Car of Tomorrow chassis. It appears that all of the sheet metal (and now, carbon fiber) has to fit the same template, so it’s basically identical, as well. - You can build any body style you want, as long as it fits the template.
“In the ‘70’s when I worked for a driver, you could tell Chevy from Ford, Ford from Plymouth...Plymouth from Dodge...”
Heck, back in the day even AMC was in the game for a while - remember when Bobby Allison won the 1974 Darlington in a Matador?
Because they are. They haven't been "stock" cars in decades. Same basic shapes. The only Chevy/Ford/Toyota parts are under the hood.