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Unpatchable AMD Chip Flaw Unlocks Paid Tesla Feature Upgrades
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
All these upgrades are one time payments for an upgrade, much like sales point dealer add-ons for conventional cars. However recently they did allow you to buy a monthly subscription to FSD. But the option to buy it outright was always there, and still remains.