The freelance services marketplace's stock has taken a beating in the last three years, but the business just kept growing.It's easy to find artificial intelligence (AI) stocks nowadays. Any tech company worth its silicon salt is at least dabbling in basic machine learning and generative AI. Those that don't offer AI tools of their own are putting computers to work on a whole new level. Close your eyes and point at a spot on a map of the Santa Clara Valley, and you'll probably find six AI start-ups sharing ...