The billionaire, who was early in Nvidia's recent upswing, is now banking on a turnaround in a certain market segment.Stan Druckenmiller made a lot of money investing in Nvidia (NVDA 0.64%), but he's finally taken some of his profits off the table.The former hedge fund manager and George Soros lieutenant first invested in Nvidia for his portfolio at his Duquesne Family Office in late 2022. He added a significant amount to his position following the launch of OpenAI's ChatGPT on Nov. 30 of that year. He cont ...