As I teleported to Luterra Castle just now, I had to block 5 new gold spammers. Given how ubiquitous they are, I’d propose offering some sort of in-game “Community moderator” program (I know it’s the title of the mods here, so some other name that distinguishes them would be appropriate, just none comes to mind right now).
Basically, individuals could apply for the role. If granted, they would have a very limited ability to issue something like a 12 hour mute on an account (I’d suggest a “shadow mute” such that the spammer doesn’t get any indication that nobody else can see their message). All mod actions would go into a queue for review and permanent action by the paid staff. If the volunteer’s actions are deemed incorrect, they could be penalized by anything from simply losing the privilege up through permabans themselves if they’re found to be abusing it.