But it also has the great benefit that the data it collects doesn't belong to you. It belongs to tesla.

Let's say you have a Tesla, but you didn't buy the "full" self driving package. You sell your Tesla to a third-party. Tesla (of course) resets the system to disable "full" self driving, but you have the tool to activate it so you turn it on for the new owner. Presumably you received money in exchange for the vehicle, as is traditional in our culture. You take some of that money and buy a 1958 Dodge D100 pickup truck and the Hayes Manual so you know where the spark plugs go. You use the remainder of the money to purchase a mix of mutual funds, Ford Motors stock, artwork by mediocre, yet somehow popular modern artists and maybe a crate of 2018 red wine.

In 10 years you still have the D100, though you have spent more money on spark plugs and air filters than you would have imagined possible. The Hayes manual is covered with grease stains so it is no longer re-sellable. The Ford Motors stock has (of course) tanked, but it allows you to justifiably rant on internet message boards. The artwork has appreciated and you recently sold it to a European collector for a profit. The red wine would have appreciated in value, but by this time you've drunk all of it.