Tesla has spent years promising that its Full Self-Driving software will transform personal transportation and launch a robotaxi network worth hundreds of billions. The company’s stock price reflects that optimism. Yet a recent investigation paints a different picture. Insiders who trained the artificial intelligence behind FSD say they have seen the system fail too often to trust it with their own lives. Reuters spoke with nine former data labelers and one veteran self-driving engineer. Seven of the nine labelers said they would not let FSD drive them. One put it bluntly. He wouldn’t ride in a Tesla robotaxi “if you fucking paid me.” Another simply stated, “We have all seen it fail.” The engineer, who reviewed crash data for years, called the company’s safety claims “bullshit.” He added, “Definitely, don’t trust Elon on this.” These accounts strike at the heart of Tesla’s valuation. The automaker’s $1.4 trillion market value rests in part on the belief that unsupervised autonomy sits just around the corner.…