Why are you getting so triggered? Do you worship LTT so much that it bothers you that what they are doing bothers us?
It's thumbnails ARE clickbait. Look at Luke's video about his laptop. Look at all of Linus' videos where he is doing some moronic face which looks like it is from Buzzfeed, or a children's science show. The entire reason they are using these new thumbnails, is for clicks, to get more clicks, to bait in clicks, clickbait. It isn't hard to understand.