They can mount GDriveFS internally as NFS, I think

Not really. I mean, drive stuff is used here and there to share some docs/attachments, etc. but not via a mounted filesystem, just from web browser.

There's a Google-wide shared file system that is mounted on all gLinux workstations, but it has nothing to do with Google Drive.

To be honest I like, forgot this -- attaching/syncing Drive and the local disk -- was a thing people did.

I just like, upload and download files as needed to Drive? I don't really have a huge "need to sync files to the cloud" quadrant in my personal or professional life.