Sanctioned use is the smaller half.
"While only 40% of companies say they purchased an official LLM subscription, workers from over 90% of the companies we surveyed reported regular use of personal AI tools for work tasks." MIT's Project NANDA, "The GenAI Divide: State of AI in Business 2025", July 2025. The report calls itself preliminary findings and rests on 52 organizational interviews and 153 survey responses, so read it as a shape rather than a measurement.