That's because Tesla does not make parts in volume, but a small batch followed by another small batch. So by reverse engineering and making such part you will s

That's because Tesla does not make parts in volume, but a small batch followed by another small batch. So by reverse engineering and making such part you will support only very limited amount of Teslas. This has root cause in constant incremental changes in their vehicles. On the other hand normal OEMs will close the car model and then start making it from same parts without a change for several years.