To back up my own files to my own Google Drive, Google required a home page, a privacy policy and terms of service. The privacy policy promises I won't sell my data to myself. I won't.
This Google OAuth client is used by one person, Ellie, with rclone on her own computer. It backs up her files to her own Google Drive and lets her browse that Drive in her file manager.
It is not a public service: no one else signs in with it, and nothing is sent anywhere other than Ellie's own Google Drive. See the privacy policy and terms.