QuoteTheranos was worth $700 million
I think that was perhaps the "book" value. But:
QuoteForbes named Holmes the youngest and wealthiest self-made female billionaire in America on the basis of a $9 billion valuation of Theranos.[4] -Wikipedia
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JedRothwell It depends what you call a "large" fraud or con and how it qualifies to be in tech. You seem to be woefully ignorant of it even in your own field! For example: https://www.fraud.org/tech_scams or https://rationalwiki.org/wiki/Modern_frauds_in_science There was also a weird scammer who claimed IIRC, wide band high speed transmission of signals over simple wire. Another made the same claim for a very narrow FM channel, again IIRC. Unknown to the marks, they actually used a hidden coaxial cable, which in one case, even went across or under a river. There have been so many scams since that I can't even find the classic one because my searches are swamped by more modern examples.
Perhaps you meant billion dollar corporations based on tech scams like Theranos? I agree those are rare. But there are innumerable tech scams on any scale -- up to very large ones.
ETA: OK... one of the scammers I was thinking about was Madison Priest:
QuoteIn 1994, one Madison Priest, then a resident of Palatka, Florida, demonstrated a bit of technology that has the potential to change the world. He was a forty-something high-school dropout who had worked for Martin Marietta. Using technology he claimed to be derived from low-energy or zero point physics, he had invented a device which could send data over ordinary phone lines at 1,000 times the current standard. He could play video on one computer and transmit it seamlessly to another 1/2 a mile across a river over the phone. "He had a Holy Grail that was the telecommunications equivalent of cold fusion," an investment banker commented.
see for Madison Priest (scroll down): http://trashotron.com/agony/columns/05-21-02.htm