53 points
If you follow the trail you get Cloudscene as a source: https://cloudscene.com/region/datacenters-in-north-america
They seem to be some cloud services marketplaces, where they link up buyers and sellers. I suspect it only lists the data centers that they have listed that are included in the graphic. That would make a lot of sense, since Chinese data centers used to service people in China are unlikely to be listed, which is why it says in all of China there are only 300 data centers.
26 points
