perhaps i do not understand your use-case but your commands do not match your goal as per the title of the topic move to another Google Drive?
rclone copy --progress --progress-terminal-title gdrive1:largeFiles gdrive2:folder
should be rclone move --progress --progress-terminal-title gdrive1:largeFiles gdrive2:folder
and if that is true, then why the need for two comamnds, this should work? rclone move gdrive1:folder gdrive2:folder --min-size 20M server_side_across_configs --progress --progress-terminal-title