Channel Desk is a private dashboard used only by its owner to see their own YouTube channels in one place.
What it reads: with read-only access (youtube.readonly) granted by the channel owner, it reads the channel's name, statistics and its own videos' titles, visibility, schedule and view counts. It cannot upload, change or delete anything.
Where it is kept: the access token and the last read are stored on the owner's own server and shown only after a password login. Nothing is sold, shared or sent to anyone else.
Removing access: the owner can disconnect a channel in the dashboard, which revokes its token, or at any time at myaccount.google.com/permissions. Its use of Google data follows the Google API Services User Data Policy.