Thing is, Roku's partners don't WANT you to record their stuff. Hulu, Netflix, Amazon Prime, etc (anyone who offers a "all you can eat" per month subscription), are all meant to be streaming "rentals", not permanent copies for your collection..
Exactly. The whole reason that media companies have graciously allowed us to stream (at the prices we stream) is because we can't record. That's written into all the streaming deals.
Of course anytime there's an output there's risk of being able to copy, but Roku can't put in a recorder and be on good terms with these companies.