That's because on a Tesla there's nothing to Mod other than some skirts and spoilers and Carbon Fiber.
No tuning, supercharging or engine airflow to improve like an ICE car.
There is no Tesla engine build to be done.
The stereo can be modded with adding subs like I did but even that hardly anyone does it would seem
based on my Aftermarket Stereo thread.
Some people do go Autosport racing their Model S Plaids where they upgrade brakes with Tesla Track Pacs and suspension parts.
Suspension, brakes, wheels and tires, wraps, weight reductions, and bigger motor swaps apply to EV's, and make up a big part of the ICE modding world. And there are even companies that offer "tuning" packages for EV's, just like for ICE cars. It's not that different in the end, just harder in the EV world when dealing with a car company that wants to void your warranty if just you open up your radiator cap.