As we know, the ability to attract investment is no guarantee of future success in any high-tech field, and especially in the surreal surroundings of AI. But at least we can admire the bravado of Californian start-up Zoox, in raising another $500 million for its autonomous ride hailing project, taking total funding to $800 million with a valuation of $3.2 billion. Less edifying was the secretive and slightly paranoiac approach taken by the company to its project, for the first three years after its launch in 2014, which quite justifiably led to accusations that it was all vaporware. But that has not deterred investors, and the company has coyly acknowledged these charges by calling its prospective range of vehicles by…