It prompted me to pull up the handy "recent device streaming activity" tab and it turns out my brother is still using it, so I guess the subscription lives another day (at least until they try to start charging per location).
The smart move for Netflix would have been to silently transition the "freeloaders" to the ad-supported plan. They should have just done that without all of the dicking around in South America and under the radar. Freeloaders start seeing ads with a friendly link to upgrade to the paid plan. Maybe they do, maybe they don't, but Netflix gets paid either way.