Those are for a different purpose. Many car aficionados have historically changed their exhaust system to achieve better performance. The fake exhaust pipes are to make the car appear performant and powerful.
In many cases, cars are sold by tickling the interest of people who want performance.
Tesla's Model S Page: "With a drag coefficient of just .208
Cd, the lowest on the planet, Model S is built for speed,
endurance and range. Improved aerodynamics and a wider
chassis offer more responsive performance so you can take
corners quicker and with more confidence." [1]
That's even the case with the Telsa Model X.
Tesla's Model X Page: "With the most power and quickest
acceleration of any SUV, Model X Plaid is the highest
performing SUV ever built." [2]
And, for people who want their Tesla to have an exhaust for barreling down the road, there are 3rd party add-ons for that!
Did you crave the performance of a Tesla electric car but
miss the sound of a rumbling V8? A UK exhaust manufacturer
may have the answer: fake external noise. [3] Youtube of
the sounds from that fake exhaust.[4]
I guess there are some people, though, who see a camera and think of a performance built vehicle.
Which part is different? The fake camera gives the appearance of a working camera.