Billionaire investor Warren Buffett, who was not much into investing in tech companies, recently changed his investment strategy to include some of his biggest positions in technology companies. Buffett has bet billions on Amazon, a stock that’s piqued the interest of many an investor, particularly those who are optimistic about artificial intelligence (AI), as per a report. Here is a closer look at the company’s performance.While Amazon might not be the first company that springs to mind as an AI giant, its vast cloud arm, Amazon Web Services (AWS), has become a leader in the AI revolution, reported The Motley Fool. AWS began in 2006 as a means of supporting Amazon’s e-commerce operations in scaling. However, it expanded into a…