This has more to do with Tesla's lack of reliance on parts suppliers than Tesla's machinations.
Part of what makes their cars so efficient is the tight integration of systems, thus everything is made in-house, and no suppliers to make parts available in the aftermarket.
Not ideal for the consumer, but not a problem, either unless your car breaks and you don't want Tesla to service it.
Once there is enough demand, someone will begin supplying parts. Until then, enjoy the fact that EV's break less than ICE cars, and hope for the best.
Non-Tesla EV owner here, and don't particularly desire one either.