YT Music is a personal tool used only by its owner.
It accesses the owner's Google Drive to download music files from one folder and upload finished videos to another folder. It does not access any other user's data, does not share data with third parties, and does not store Google data anywhere other than the owner's own Google Drive and the temporary build machine, which is deleted after each run.
Contact: open an issue at github.com/alexchie/yt-music.