Because they are the biggest offenders, for three years running. Rather than trying to target the abstract 'beverage industry' as a whole, it's much more pragma

Because they are the biggest offenders, for three years running. Rather than trying to target the abstract 'beverage industry' as a whole, it's much more pragmatic to just look at the biggest players. Besides, they tend to set trends so there's a little bit of top-down influence as well in being the industry leader.