Because if we used Flyer or Futura or even Gill Kayo, it would mean “this movie sucks.”
It takes a while for the trend of ballpoint-pen illustration that was talked about on design blogs 18 months ago to trickle its way into “the mainstream,” to the extent anything Dave Eggers and his wife with the name one cannot take seriously (Coldplay album title? “hasta la Vida”?) actually are mainstream. And of course Juno authorized it, and now it’s everywhere. I fear Steven Heller will have colonized and assimilated this trend under the catchphrase “cult of the squiggly.”