you need to run the real mount command and use a debug log.
change --log-level INFO to --log-level DEBUG
best to use default values for flags, unless you are 1000% sure what the flags does.
really, the less flags the better.
also --fast-list does nothing on a mount, so you can remove that. --drive-use-trash is not needed, as the default is true. --cache-chunk-no-memory, does nothing, so remove that as you are not using the cache backend.
2020/12/06 17:21:47 DEBUG : rclone: Version "v1.53.3" starting with parameters ["rclone" "mount" "cloud:" "--log-level" "INFO" "to" "--log-level" "DEBUG"]
2020/12/06 17:21:47 DEBUG : Creating backend with remote "cloud:"
2020/12/06 17:21:47 DEBUG : Using config file from "/root/.config/rclone/rclone.conf"
2020/12/06 17:21:47 DEBUG : Google drive root '': root_folder_id = "" - save this in the config to speed up startup
2020/12/06 17:21:47 Fatal error: Can not open: to: open to: no such file or directory
2020/12/06 17:45:00 DEBUG : rclone: Version "v1.53.3" starting with parameters ["rclone" "mount" "cloud:" "/home/cloud/" "--log-level" "DEBUG" "--log-file=debug.txt"]
2020/12/06 17:45:00 DEBUG : Creating backend with remote "cloud:"
2020/12/06 17:45:00 DEBUG : Using config file from "/root/.config/rclone/rclone.conf"
2020/12/06 17:45:01 DEBUG : Google drive root '': root_folder_id = "0AHuM_j48UAXKUk9PVA" - save this in the config to speed up startup
2020/12/06 17:45:01 Fatal error: Directory is not empty: /home/cloud/ If you want to mount it anyway use: --allow-non-empty option