Way back when Netflix was mostly still non-original content and movies, the US had a far superior selection compared to Canada, so a lot of us Canadians used VPNs to get access to US content.
Around 2015 Netflix clamped down hard on VPNs, such that I couldn't even use them to watch any content, let alone content from specific countries. I tried a few options and all failed, so I assumed most other people gave up with me.
On Netflix’s side, they would see multiple accounts accessing the service via the same IP ranges.