Yeah, there is no way.

That addon would need to be able to read everything on screen, as well as access the script of the video, the comment section, the video description, and any links that are provided, It would also need to be able to decipher sarcasm/tone/irony/context.

It would then need to check the facts as stated in the video, in the context that they are stated in the video, then confirm/refute each point using source that it would also need to verify.

Then, it would need to also need to keep track of any edits made to the video (which you can do after uploading), description, comments, any links, and the content on the webpages of those links.

It would then need to have an overlay, maybe even something that auto-pauses videos, to tell you the findings as well as the sources that the addon found, and maybe even why the sources they use are trustworthy.

You could maybe do something like Xitters community notes and make a plugin that allows watchers to make comments on sections of the video and then have users of the plugin to up or down vote them. The problem would be that unlike Xitter, Youtube has a semi-functional suggestion algorithm, so you’d probably end up with echo chambers all making and up-voting comments that re-enforce their worldview. Well… that and the huge numbers of morons online.

Edit. retracted, didn’t see this was .ml lol. forget it

I bet you could write a prompt explaining what you were attempting to do, and feed a transcript of the video into it (probably in chunks), and have it do that fact checking for you.

I also bet it would be wrong a portion of the time, and then who checks the fact checkers? 🤔

Something along the lines of matching a group of expert people and make them fact check popular videos(wiki style).

There is already something like that for news articles.