to my knowledge you cannot dupe or it is very hard to dupe on community servers because you can't carry characters over.. so I'm proposing maybe if you no longer allow characters to swap between official servers maybe you will wipe out dupers. it may sound unappealing or even mundane or stupid but if stopping them is so hard why not ensure a sure fire way to put a end to it at a lesser cost? people who join the wrong server anyway wouldn't get their characters moved they instead would be a freshie and could log out and join the right server with their friends.. I'm sure I've not thought this completely through and it may be a horrible idea but I very much so enjoy official DayZ and it's genuinely at risk on consoles infinite supplies and explosives whenever you want means it's just a duper vs duper playground and not a legit player friendly server. alternatively having strictly vanilla servers on community could solve the issue in the opposite way. currently official servers are pointless if you want more than a life to life experience and your game is currently being ran by player owned servers which have their many many own flaws not offering the official vanilla DayZ experience we all love