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Tesla Switches Full Self-Driving to Subscription Only
(consumerrights.wiki)
This is a most excellent place for technology news and articles.
The only cases I've heard that fit this, is some of the old model S where "free supercharging" got removed from vehicles that were resold through Tesla.
Do you have a link to cases where functionality actually got removed from vehicles sold privately directly? I wouldn't be surprised if it happened, I just haven't heard of any.
Yeah they probably could, like all manufactures can these days, but I haven't heard of it actually happening outside of them going back in to Tesla to be resold. Directly from person to person they retain features and even free supercharge access.