Banned accounts can't use family share for that game anymore.You have regional pricing with aoe. The game is fairly cheap everywhere. It's not like aoe4 with its global 60 dollars or so.
Find a better excuse. Or just don't complain about "smurfs ruining the tg ladder" everyday then. Because this feature you love so much is what allows it to happen.
If they ban canary right now he can just create a new account and play again 5 minutes later for free. Enjoy your family share!
So, my take on this is that there are only a few individuals rightfully using the feature while its being abused and exploited like crazy by a large amount of users. To smurf and kill noobs or to cheat. All of this while the game is not even expensive. So yes, I think forcing these guys to pay for another copy if they want to keep doing that sounds perfectly reasonable. At the same time i'm sure each copy sold helps to keep the game alive much longer. So it's a win win.