If the Quickflix Android app really worked properly, it would be on the Google Play Store. Why is it only available on certain Samsung Android devices? A few speculative explanations. Maybe Samsung has guaranteed that their devices have impenetrable DRM that will absolutely prevent anyone from seeing Quickflix movies streamed when they're not supposed to, or saving or intercepting them for later. Or perhaps Samsung signed some kind of exclusivity deal with Quickflix (which sounds unlikely - it's not really in Quickflix's best interests to limit their availability). Or it's a matter of device compatibility. That also sounds unlikely, especially since YouTube has a video streaming app that works just fine on every Android device I've ever held. So the only plausible explanation is DRM, but if the Samsung/Quickflix DRM actually worked the way it should, the app could safely go on the Play Store, secure in the knowledge that their DRM was protecting their content exactly as designed.
Mokalus of Borg
PS - So someone, somewhere, is being inconsistent.
PPS - It's just not clear who or how.