Most Helpful Guy
I feel like every youtuber is going to use the assets they can to get as many views as they can. Like for instance, many youtubers use clickbait titles and sexual thumbnails to entice a click. (Often in the humorous "PRANK GONE SEXUAL PEWDIEPIE EXPOSED?" sort of fashion.) It's a competitive market. I wouldn't call it necessarily abuse. It's just kind of an inherent advantage perputrated by the viewer's psychology.
From that, it just so happens that more guys would click on a video showing extreme cleavage compared to girls clicking on a video showing a dick. It's just how the mind works I guess lol.
I don't think it will make a defining difference, but it makes a difference nonetheless. Like if a girl has completely crap videos, she'll be beaten out by the guy with good videos. However, it does increase views for sure. As it's often said, "sex sells."
Most Helpful Girl
"Abuse"? No. Not at all. It's the power of pretty. Girls and guys that have it, should utilize any and all assets they have to promote their business. I believe pretty only gets you so far though. They may tune in initially for how you look but they'll stay for what you have to say.