Chat systems changed search behavior. People ask one question, then three follow ups, then buy. If your brand is not recalled or cited inside those answers, you vanish from the conversation. OpenAI's own research and product pages reference 700 million weekly active users of ChatGPT, which makes inclusion a serious growth channel, not a side project. See the OpenAI usage study and the research PDF for details.
In early 2025, Reuters reported 400 million weekly users, which shows the growth curve and a conservative baseline to plan against. Reuters coverage.
Google's AI Overviews also matter. Google stated rollout to hundreds of millions with a goal of over a billion people in 2024. That is the adjacent surface where citations are explicit. See Google's announcement.


