Just guessing based on the authors’ names and their affiliation with Alibaba Group, but I think this research was published by exclusively Chinese citizens.

In my experience, it’s difficult to operate a small, personal website from within China because of their regulations in regards to non-government websites. Because of this, you will often find that Chinese citizens will use approved (or at least unrestricted) services like GitHub pages.

Having worked closely with many businesses based in China due to my hobbies, I have noted that services like Google Docs and Drive are favored for this reason.

I would guess there are ways to host content like this more easily on platforms that are only accessible within China or are not navigable without the user understanding Chinese language.

I would also guess that this is part of the reason why services that target customers in China tend to become “super apps” that combine several services that non-Chinese users would expect to find on disparate sites. For example, services may combine a social media style newsfeed/interaction API, banking, email, shopping, and food delivery into a single platform.