Digiday: Hulu founding CEO Jason Kilar had an ambitious goal and a $75 million war chest when he launched Vessel last March: directly challenge YouTube by courting top publishers and YouTube stars to distribute content on Vessel first — and rethink video advertising for a mobile world. It’s proving to be a tough sell so far. Now with $132.5 million in venture capital backing to date, Vessel’s viewership is barely afloat.