Really no different than any classic car, really. GM isn't selling OEM parts for a '57 Chevy, for example. If you need replacement parts on those, nowadays, you're likely going to specialty manufacturers given there really aren't any "parts cars" around anymore.
Tesla’s corporate leadership would be much happier if the Cybertruck was selling 100,000 units a year and was not at all a collector’s item.
Good book on the subject: https://www.sup.org/books/history/disaster-dearborn
And all the well-documented reliability and quality issues.