It's mentioned in the article. Boy's Life actually has a noble mission behind it, whereas Girl's Life is for-profit trash (essentially). The parallelism between the names of the two is an unfortunate coincidence. Near as I can tell the Girl Scouts don't have a magazine, but if they did, it would be a better comparison against Boy's Life. Maybe they should publish one?
As an aside, The Girl Scouts is a really fantastic organisation. In particular compared to The Boy Scouts in the US (which is much more religiously affiliated and discriminates against gay people; The Girl Scouts by contrast are trans-inclusive).