This is the relevant change in the EULA you need to accept when downloading (installing?) the GeForce driver. The article is weirdly translated, this is apparently a global NVIDIA thing and not specific to "NVIDIA Japan".
> No Datacenter Deployment. The SOFTWARE is not licensed for datacenter deployment, except that blockchain processing in a datacenter is permitted.
> No Datacenter Deployment. The SOFTWARE is not licensed for datacenter deployment, except that blockchain processing in a datacenter is permitted.
Edit: http://www.nvidia.com/content/DriverDownload-March2009/licen... and https://www.geforce.com/drivers/license/geforce