Well this is just awful then. I just logged on to find out this new rule. My friend isn't allowed to play because we "play from the same location". We aren't currently at the same location. So, what's happened? Because they took their turn from my house once we've been blacklisted from ever playing again? I understand not allowing playing a game together from the same IP (although I don't agree, I understand), but why can we not play from separate locations now?
If cheating is a concern, same location play should be allowed for private and unranked games. Problem solved. My friends regularly check their turns when we're in the same place, even though we don't live together. This will unfortunately render the site completely unusable for me, as I don't play with randoms.
Edit: scratch some of that. Just started working for us. When I first left friends house, I tried joining a game from a different device
and a different network, and I got the same error. Now it started working. Possible something on BGA's side took time to clear?
Anyways, that's something at least, but I did often play on the couch with friends and the wife. I hope this gets reconsidered in the future.