Well, we're all different. Personally I prefer my arms a little towards the straight position. The rider in the middle looks very cramped to me. I could not tolerate my arms being bent like that. Also, it looks to me like the rider on the left (white scoot, I think that's the Suzuki) appears to be much smaller in stature than the other riders, so with shorter arms, that position would be logical.
To each their own.
2007 ABS Wee-Strom "The Silver Surfer"
2003 Kawasaki Concours "Mabel, the Flying Kaw"