A study by Microsoft and LinkedIn found that 75% of knowledge workers are using generative AI tools like ChatGPT at work but keeping it quiet. Over 50% of AI users are reluctant to admit using the tools for important tasks out of fear it makes them seem replaceable. Most workers brought their own AI tools into the workplace rather than using tools provided by their employers. Younger workers are most likely to use personal AI tools at work, but the trend spans all generations. The rise of personal AI use at work raises security concerns if tools access company data without oversight.