I use this extension, clickbait remover for youtube. Does it’s job perfectly well!
Clickbait remover uses YouTube’s auto generated ones, which while are seemingly random, are not. They use some algorithm to target faces in exaggerated expressions.
DeArrow uses actually random ones (and then a user can submit specific timestamps if there is a better one). It’s noticeable better on many channels imo
(I made DeArrow)
I really like your idea. What do you think about showing 4 random thumbnails in split-screen to give a better impression of the content?
YouTube Clickbait-Buster has a feature where you can see all the images from the hovering preview from the seekbar. A more refined version of that could be interesting to look into in the future maybe.