1395
Researchers jailbreak a Tesla to get free in-car feature upgrades
(techcrunch.com)
This is a most excellent place for technology news and articles.
Flipping a bit in software doesn't cost Tesla anything, the hardware is already installed.
It would be totally different if Tesla didn't install the hardware by default, and you had to pay to have it put in.
It doesn't cost VW anything either, they still want 1500€ to enable the fog lights to turn on when taking a turn (not sure how what feature is called).