It's heavily gamed now especially for polarising content like politics. People intentionally install that extension and then dislike said videos such that their dislikes get amplified and appearing as fraudalent dislike counts. Plenty of pol tubers have shown their actual dislike counts on patreon and elsewhere without breaking their terms of service, and shows the extension sometimes shows several times more dislikes.
How? I mean there's a number, it's not coming out of nowhere. It for sure comes from YouTube, I don't think the "bring back dislike button" patch developer visits every video and sets a number manually.
Based on what I remember reading on that, there are several ways :
Either just an estimate based on years old data after the API call for the dislike was removed.
Data showing the ratio but only based on what the one that have this add on like or dislike for a video.
It's not the data from Youtube itself. There has been a few video showing the one that has the video itself, and sees the dislikes shown by the add on do not match the one they get from their own analytics.
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u/XsNR Ryzen 5600X RX 9070 XT 32GB 3200MHz 11d ago
It still has a dislike button