I wasn't aware that rclone could create a direct connections and had a quick skim through the documentation where I found this in the FAQ (https://rclone.org/faq/)

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Can rclone sync directly from drive to s3 Rclone can sync between two remote cloud storage systems just fine.

Note that it effectively downloads the file and uploads it again, so the node running rclone would need to have lots of bandwidth. ----