Ok I feel that a good solution to chat bots would be to source the issue out to players. Open up applications for people to be on for scheduled times and pay them in “TP”. Have at least one person per time slot per server.
Allow them to temporarily chat ban people for 4-6 hours. Have a staff member run a query to see who has been chat banned by the player every few hours and issue out account bans to chat bots. If the player is caught chat banning regular players, take away his privileges and temporarily lock their account.
During certain times the amount of bots in game are ridiculous. And its only going to get worse when the game goes completely free to play. This would be a way to quadruple the amount of people that are able to take care of them with minimal cost to the company and minimal amount of extra coding needed.