Not sure if this was asked already but it'd be nice if rclone could use folders for Google Drive Service Accounts instead of Service Account credential files. This way if you happen to hit the 750GB limit on one credential it should automatically switch to a new one.
This would be particularly useful when mounting a folder. I'm backing up my NAS to GDrive Business and often hit the 750GB daily limit. I tried using the "chinese" version of AutoRClone which supposedly switches automatically, but it doesn't do so for the mount command, only for the copy command flag.