For Roku, at least, I think the way it works is you give your credit card once and then you select channels through Roku. So in this case it's not any less con

For Roku, at least, I think the way it works is you give your credit card once and then you select channels through Roku. So in this case it's not any less convenient. It made sense to go with Netflix when nobody else really had a streaming implementation, and Netflix had its own advertising the content providers could piggyback off of. But these days more and more people are getting content through third party boxes that already act as payment processors.