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Linus Tech Tips uploaded a video showing how to block ads on Youtube. Which was removed by Youtube for community guidelines violations.
(sh.itjust.works)
https://files.catbox.moe/a6111d.png / https://nitter.poast.org/LinusTech/status/1825956050685800834
If you go the video, https://www.youtube.com/watch?v=GsjHMzGl-VY. You will see it's gone. So Youtube being Youtube.
Here's a Odysee mirror of the video, https://odysee.com/@jopec:7/linus-tech-tips-degoogle-your-life-part-2-adfree-youtube:0.
That's the way that yields the longest combined watch time from the audience.
Do they go back and change thumbnails after a while? LTT does focus on a lot of evergreen content as well.
YouTube gives a b testing for YouTubers based on watch time, so they can tune their thumbnails to the one that gets the most watch time. The audience doesn't always know the history of the chanel, they need to go off the thumbnail.