Google parent Alphabet lost just over $500bn £374bn in value on Thursday after it rattled Wall Street with its last update of the year on its business operations. Google spooked investors so badly that its stock hit a six month low, after it revealed its artificial intelligence AI summaries on search were affecting ad revenue. Microsoft and Amazon also updated investors this week, and joined Google in plans to keep spending astronomical sums of cash in an ongoing AI race. But investors...

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