Hulu is not free in any useful sense. You can play a limited selection of their content on a PC without a subscription, but full access and use on mobile device

Hulu is not free in any useful sense. You can play a limited selection of their content on a PC without a subscription, but full access and use on mobile devices, consoles, and things like Roku and Apple TV requires a Hulu Plus subscription at the same price as Netflix. I'm not saying the other services don't have content people want that Netflix does not have, I'm saying they're going to want the content Netflix has, too.