> Being honest as long as something like this is available I don't really see what a site like netflix could offer that would convince me to pay

Most people are honest, and will do the the legal thing when faced with two equal options. If the choice is between that UI but it's illegal, and a reskin of that UI but it's £30/mo, I'd pay.

But it's not, as the other comments here said. It's a choice between that for free and a limited catalog of region restricted, ever changing, poor video quality streams spread of multiple services, and given the choice between paying 4 providers for a poor service and getting a good service from one location, people will pick the latter.