My Drive Sync is a personal-use tool operated by its owner for the owner's own accounts only.
It accesses files in the owner's own Google Drive, solely to copy them to and from the owner's own OneDrive so that the two stay in sync.
Nothing. It has no other users, collects no data about anyone, and does not sell, share or transfer Google user data to any third party. Files move only between the owner's own storage accounts. Nothing is used for advertising or for training AI models.
The tool keeps no copy of file contents beyond the owner's own Google Drive and OneDrive. Access can be revoked at any time from the owner's Google Account permissions page.