Allow people who are network-banned to stay network-banned, but be able to connect to Playerservers via the PS shortcut ip. That way it's their fault for cheating on the network servers. The playerserver owners can just deal with the cheaters if they're breaking rules on the playerservers. It's also harder for them to cheat on playerservers, because they need to remember and put in the PS name into the shortcut ip just to connect to a specific PS. Not anyone's fault if the PS owners can't deal with cheaters who remembered their PS server name.
TL;DR; People who cheated on the network servers (warzone, tntwars etc.) are network-banned, but are able to join playerservers, because PS are
90% players' creations, not the networks'. Network only connects playerservers to the hub and warzone, and all the other network-servers.