“Due to the salvage status of your Model S , I have been instructed to cease providing you with parts. Tesla is very concerned about vehicles with salvaged titles being improperly repaired. Going forward, all salvaged vehicles must be inspected by us or our approved body shop, Precision Auto Body. If declared a candidate for proper repair, reconstruction must be completed by a Tesla-Certified Body Shop.”
Tesla are a small part of the automotive industry, a low volume manufacturer making products with limited availability. I think this will likely change one day, but for now, if I ran an indy mechanic shop, and advertised Tesla services, I would be surprised to get one inquiry in a year.
Tesla doesn't really lock it down any more than they need to for safety and sanity reasons, as far as I can tell.