I got tired of seeing clickbaity thumbnails and wondered if I would be happier without them at all. I added `ytimg.com` to my blacklist as a wildcard about a month ago and I've found that I use the website more *deliberately* than before. And it works on the YouTube app for Android and my smart TV! If you don't want to block it for every device on the network you can add it to the Group Management lists as well.