Almost every guy in that list is pretty damn handsome. The notable exception is Luisito Comunica, who I'm guessing makes up for it by being exceptionally interesting.
"Pretty handsome" is relative. Pewdiepie is a good-looking guy, but his analogues on Instagram are 1000x more so. And I can't imagine someone like Casey Neistat becoming remotely as big an Instagram star as he is on YouTube.