Why do youtubers update their youtube thumbnails?

Thousands of videos change thumbnails every day.
Why do you need to customize your Youtube video thumbnail?
YouTube is the second largest search engine in the world, and the third most visited website.
The Best Inspirational Youtube Thumbnail Library
Thumbnails are often overlooked as it is one of the most important things to improve your CTR. Yet the thumbnail of your video is your showcase, it would be a shame to underestimate it.
Because finding thumbnail ideas or watching what the best makers are doing isn't easy, we've created the best library to help you.
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