Elon Musk is now making bold promises about Optimus. Are robotaxis already a thing of the past?

Tesla ( TSLA 2.27% ) CEO Elon Musk spent years hyping the company's robotaxis, leading up to the autonomous electric vehicles' launch in Austin, Texas, in June.

Musk said a robotaxi network would make Tesla the most valuable company in the world, and described fleets of autonomous Teslas gradually taking over the world. He unveiled the autonomous "Cybercab" at a splashy event last October, and he's proposed that individual Tesla owners would be able to cash in on the emerging technology, renting out their vehicles as autonomous ridesharing vehicles when they're not using them. Tesla backers like Ark Invest's Cathie Wood have argued that robotaxis would send the company's valuation to $5

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