1. Unknown: If the Guo Hong study is not well publicized and popularized, it may not attract many people's attention.
2. The user group is relatively small: Because Guo Hong Research mainly serves medical students and doctors, this user group is relatively small, so fewer people use it.
3. Fierce competition: Compared with other online education platforms, Guo Hong Research faces fierce competition. Other platforms may have broader courses and services, or stronger brands and user groups.
4. Adaptability of learning contents and methods: Different users may have different learning methods and styles, and it may take some time for Guo Hong research to adapt to the needs and methods of different users.
In short, the above are only some possible explanations, and the specific reasons need further research and investigation.