Uploader is a private, self-hosted tool that publishes videos to its owner's own YouTube channels. It runs on the owner's home servers and is not offered to the public: there are no sign-ups, no accounts and no other users.
Uploader uses YouTube API Services (the YouTube Data API) through Google sign-in (OAuth 2.0). The owner authorises it once for each of his channels, and it only ever acts on those channels. By using Uploader the owner agrees to be bound by the YouTube Terms of Service.
See the privacy policy for what data is involved and how to remove access, and the terms of service for the conditions of use.