The uninstall rate for ChatGPT's mobile app in the U.S. surged by 295% on February 28, following OpenAI's announcement of a partnership with the U.S. Department of Defense. This spike, reported by Sensor Tower, contrasts sharply with ChatGPT's average daily uninstall rate of 9% over the past month. The partnership has sparked backlash among users, leading to a significant increase in negative app reviews. In contrast, Anthropic's AI model, Claude, experienced a surge in popularity. Downloads of Claude rose by 37% on February 27 and by 51% on February 28, as Anthropic publicly declined to collaborate with the Department of Defense, citing ethical concerns. Claude's app climbed to the top of the U.S. App Store's free apps chart, reflecting a shift in user preference towards AI models with ethical stances against military collaborations.