Nothing has been sold. The new prompt is Firefox's rule - every extension now has to label what it sends, with the same broad labels. For RYD that's the ID of the YouTube video you open, to look up its dislikes, and your likes and dislikes with a random ID that isn't linked to your Google or YouTube account. That's how it always worked.
The code is open if you want to check: https://github.com/Anarios/return-youtube-dislike