Nikola Tesla was not a failure at all. You’ve some serious balls to run your mouth so reckless. He just had no care for business.
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I agree he wasn’t a failure in regard to invention, however I disagree that he didn’t care for business, he was just terrible at it. He tried to compete with Edison, was very rich at one time, and then lost it all. Westinghouse refused to give him more money, though I read Westinghouse took care of his expenses during Tesla’s later life.
Tesla’s big mistake with selling George Westinghouse his patents was to take deferred compensation in the form of stock options. When Edison’s cronies drove Westinghouse stock into the ground in a bid to take over Westinghouse, Tesla was ruined.