> Plus you'll have two problems with Profiles. One, each user could have their own profile and therefore machine learning isn't going to detect abnormal viewing patterns. Two, some people choose to share a single Profile and so it'd be unpredictable whether you could deduce unusual viewing habits from that.

They'll just do it from account not profile.

And Netflix has external 3rd parties contributing to their recommendation teams and their geofiltering and proxy detection teams...