It gets a lot more ambiguous when the features being offered also come with increased risk of warrantly liability. I'm thinking of things like acceleration boost here rather than FSD and other driver assistance features.
For FSD, part of the payment is for ongoing maintenance. It is likely that the countermeasure would be subscriptions, and they already seem to be progressing in that direction.
FSD is a little trickier. FSD hardware is installed in your car and is used for ADAS. FSD is completely different firmware and has to be downloaded from Tesla servers which will check to see if you paid for that service.
It might be possible to subscribe to FSD, wait for it to download, then unsubscribe, and hack it to re-enable the firmware. But FSD is still beta and you'd be risking being exposed to get future updates.
For FSD, part of the payment is for ongoing maintenance. It is likely that the countermeasure would be subscriptions, and they already seem to be progressing in that direction.