The supply chains in automotive are also becoming more dominant and most of the stuff in your car is sourced from Aptive or Bosch or Continental or whoever.
So it's not just a commodity yet, but it will be - especially towards the lower third echelon of the market - in a decade or two (a decade is not long in auto industry terms; it's merely two product cycles).
The number of automakers in the 1970s was much higher and the number of unique models (vs dress ups like GM does across brands) was higher still.
Virtually no mass market car brand was formed in the last four decades, other than Tesla.
If you need laws to protect your business plan, your business plan is probably not the best way to make money for anyone but you.
I work in the industry and you would be shocked at how sluggish these companies have gotten.