When you connect a channel, Chillframe asks Google for three permissions and nothing else. One lets it upload the videos you publish or schedule, with their title, description, thumbnail and visibility. One lets it read your channel's public profile and lifetime numbers, like your handle and subscriber count. The third lets it read your performance figures, views, watch time and where they came from, which is what fills Analytics.
That leaves plenty it can't touch. It can't change your channel settings, playlists or comments, because it never asks for the permission those need. It can't read your private playlists, subscriptions or watch history. And it doesn't delete or edit videos on your channel, including the ones it uploaded: the title, description, thumbnail and visibility are set when the video goes up and never touched again.
If you'd rather it had none of this, disconnect at Settings → Channels with the Disconnect button. Chillframe hands the access back to Google and stops publishing to that channel, and everything already on YouTube stays exactly where it is.
The exact wording of the three permissions is on chillframe.com/privacy, under "What we access". Anything else about the connection, email [email protected] and a human will read it.