Tesla has changed the meaning of 'Full Self-Driving' to no longer imply unsupervised autonomy, instead describing it as an advanced driving system. This change comes after years of promising unsupervised self-driving capabilities, which have yet to be fulfilled. The company has sold a software package called 'Full Self-Driving Capability' for up to $15,000, but now acknowledges that vehicles produced between 2016 and 2023 do not have the necessary hardware to deliver unsupervised self-driving. The change in definition has raised concerns about false advertising and the company's commitment to delivering autonomous driving technology.