Some people just don’t know how to smile in front of a camera.

Or it’s part of their clickbait thumbnail strategy, like how other Youtubers make an obnoxious face because those thumbnails get clicks.

Because that’s not a smile, he’s just showing his teeth. His eyes are dead and joyless… definitely off-putting.

It’s an expression that’s optimized to maximize the click through rate of a video. Unfortunately it also looks hideous

At least part of the problem is the stache.