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Apparently some previously-scrapped data for older videos that gets updated, and heuristic estimates combined with extrapolating data from those who use that extension and like/dislike. LTT did a video where they found the accuracy really good.

Beating Google at their own game, they (apparently) are.

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I think the accuracy doesn't even matter too much. Personally, I believe I base my decision to watch the video after clicking on it on the ballpark the like/dislike ratio is in. "Almost only likes", "2/3 likes", "50/50 likes/dislikes", ... For that purpose, the extension does its job.

> with extrapolating data from those who use that extension and like/dislike.

Often you see the opposite, where a third party service provides customers with a feature extending the features of a big service like youtube or twitter, and then the big service buys the startup offering that extension, or integrates the feature themselves, leaving the extension dead. Now we see it happening in reverse direction, very interesting.

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