Companies should be sued for false advertising if they claim that their streaming service allows you to "buy" or "own" anything (unless their service includes non-DRM downloads for permanent offline storage). All you're buying is temporary use of their rental network and library. Which is fine if that's what you wanted and knew you were getting, but a problem if you were expecting something else.
In the US it is a grey area. I think they should be more explicit and allow you to make a copy on a different medium as long as you aren't sharing it outside of a household.
If someone actively engages in piracy they should be subject to a small and reasonable fine similar to a speeding ticket.