They told us that this is normal because Google File Stream will always and forever be syncing files that are on Google Drive over and over even if they have not been updated since the last time they were synced.
We asked Google Drive support why it was taking over a month of 24/7 syncing to sync 2GB of files? This is done by right-clicking on each folder/file – going down to Drive File Stream – and selecting Online Only. We have 800GB of files on our Google Drive, so we only wanted to sync 2GB of these files with Google File Stream on one of our Mac’s, and for the rest of the files (798GB) we selected the “Online Only” option. Why is Google File Stream Syncing Forever?