I was wondering because if they use wifi & bluetooth discovery, then a VPN isn't going to help,. one phone will see a certain bunch of your neighbour's SSIDs while another phone will see other. Also A-GPS is not technically GPS, it is cell tower triangulation, the name of your cell towers and in what quadrant they're seeing your phone (that's how they caught Mitnick).

Also the wireguard VPN acts as a L3 separation, so you still see on your L2 segment, different MACs and different addresses in the broadcast traffic.

I imagine that Netflix would use an heuristics based machine learning system, so while not one particular aspect would out you as part of a different household, an inventory of signals might make them suspect you "enough" that they start harassing you with 2 factor authentications invalidating your session cookies. Not exactly expulsing you from the service but just annoying enough that most will prefer to cough up a few more bucks for a separate account. And of course, as their needs to supplemental revenue increases, they'll be able to tweedle your knobs until they get just the perfect amount of annoyance to convert "freeloaders" into paying customers rather than defectors or pirates.