The reason that Zuckerberg is singled out is simply because of the scale ($45 billion). The same reason that McDonalds is criticized for unhealthy food instead

The reason that Zuckerberg is singled out is simply because of the scale ($45 billion). The same reason that McDonalds is criticized for unhealthy food instead of Burger King/Wendy's/Carls Jr., or Apple criticized for labor conditions instead of HTC/LG/Samsung.