Cars are titled property that most people finance or lease and generally involve the navigation of significant government regulation and financial paperwork to register and operate. This is why essentially zero car dealers have return policies, and even those who tried it for a while like Tesla gave it up.
I don’t expect a price match/return policy on other titled property I buy either, like homes.
Price match and return policies are voluntary structures that some retailers put in place in high competition / low margin sales environments. It’s also something you can and should consider BEFORE the purchase when deciding where to buy from. Tesla has no posted price match policy. If that’s important to you, you should probably have selected a manufacturer/dealer that offers such a guarantee. Demanding one after the fact because things didn’t go your way is not rational.