Mostly because it's entirely pointless, technologically. Netflix isn't even a particularly good source of digital video for piracy; the free-love internet video sharers are going to rip from the higher-res, sooner-available, better-library, non-DRMed commercial pirate versions.
The only people likely to rip video from Netflix are casual copiers, digital information hoarders, and people with legitimate compatibility/access issues.
It's kind of baffling that anyone making money off this business would want to drive these paying customers into the arms of Bittorrent, YouTube, etc.
Assuming the CDM used by the (possibly open-source) browser is open-source, you can just save all the decoded frames.
Someone will do that, big media will be mad, we'll have more laws, browsers will be forced into having a binary blob in by default, avid Netflix watchers will be so happy.
The only people likely to rip video from Netflix are casual copiers, digital information hoarders, and people with legitimate compatibility/access issues.
It's kind of baffling that anyone making money off this business would want to drive these paying customers into the arms of Bittorrent, YouTube, etc.