China's increase of 42 systems on Top500 is largely attributable to a single company. Chinese "internet company A" (as labelled by Top500 https://www.top500.org/site/50596) is presumably Alibaba, judging from its residence city of Hangzhou. It alone counts for 35 new machines on the list since June! (Click on the history tab to see the number for yourself.) I wonder if they are part of Alibaba's cloud services or for internal uses. Either way presumably Alibaba sees commercial value in owning them.