If you offer a feature and call it "Autopilot" and then go on to offer what you call "FSD" for a substantial additional charge, then you'd better be able to deliver that experience.
These Tesla cars don't, just as my Accord doesn't nor do those from any other manufacturer. FSD will exist if and only if we build smart highways and mandate a common intercar communication a common protocol.
Tesla can fix this with no more than an OTA software update and can remotely brick any car whose owner rejects it, as they will have to do.
Meanwhile, Tesla will continue as the largest producer of EVs in the world, tax credit or not, despite some of the Debbie Downer doubters in this thread.