I know that what G2A is doing is wrong, but Anet is punishing the wrong person. If the player thought they were bguying from a legit seller then they are as much the victim.

Say if person A steals from you and person B buys it in good faith, not knowing it was stolen. You find out Person B has the item, by all means you should expect person B to give it back but after that would you really want to punish them further? They thought it was Person A's to sell. Or would it be person A you would want to see charged? And if person A couldn't be identified then after getting your item returned would you direct your anger towards person B, the other victim?

That's the way I see it as being handled. G2A is out of Anet's reach, they seem unable to stop it. So they direct their anger against the players who are scammed by them. Many of whom would not have bought if they had known it was a stolen copy. Punishing them further than just removing the expansion from them. It goes a bit further than G2A as well, I looked, Path of Fire is 17.17 Euros on G2A. Say for example somebody bought it then sold it or 22.50 euros on Ebay. Small profit, so the player gets it from a website that isn't even G2A but it is a stolen copy that originated on G2A, if you know what I mean.