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Tesla will sue you for $50,000 if you try to resell your Cybertruck in the first year
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
Tesla doesn't want some other company to buy all its vehicles and turn around and sell them at a higher price, damaging the press around the Tesla brand and stopping its cars from getting to would-be Tesla super fans. It's the same reason stores will sometimes say "limit 2 per customer" on certain items.
That's one reason, anyway.