Another reply from google:
Hello,
Thank you for contacting Google Workspace Support. We appreciate you reaching out and sharing the issue you're encountering with uploading large files through Rclone in Google Drive.
We understand that you're unable to complete the uploads, and we apologize for any inconvenience this may cause. Unfortunately, issues related to third-party applications like Rclone fall outside the scope of support we offer for Google Workspace.
However, we want to do our best to help. We've found a relevant thread on the Rclone forum that discusses issues related to Google Drive uploads failing with HTTP 429 errors: Google drive uploads failing, http 429. This thread might offer some insight and potential solutions to the issue you're facing.