Just wondering along the lines of 'perhaps a cigar really is a cigar'. What would Microsoft be doing with the text of every PowerPoint presentation once they h

Just wondering along the lines of 'perhaps a cigar really is a cigar'. What would Microsoft be doing with the text of every PowerPoint presentation once they have analysed the style/font/content information? Must be thousands of slides per hour 24/7 for years. How long is this information kept?