You’re well within your right to buy a Tesla, modify it to the moon and back, and use it independently however you want. I hate Tesla as a company and I’m a strong supporter of these rights, but I stop at claiming that businesses have an obligation to continue supporting a product with unknown arbitrary modifications.

To the extent that a product is designed to only operate efficiently (or at all) with continued access to manufacturer services, it’s probably a bad idea to disqualify yourself from that access. But there are only two ways to solve that, either A) disallow the sale of products that rely on first-party services, or B) requiring manufacturers to uphold their end of the services contract while you do god-knows-what with your end of it (the product). Neither of these is the clear moral high ground that hacker types seem to think they achieve in this argument.