On my server, spying has rarely been a problem since most members are immediately white-listed when they are accepted so none can spy. It was only a problem before white list. Though we had slacked off on that, once we did the leader of a rival group (who was away for a while) came back. That war they beat us and the strongest group on the server. We are the second strongest with more ppl but less of the top 20.They avoided all of the dangerous lands, both vs us and the strongest and for that week won. Now only the ppl who have talked in discord for a long time and been in the group a long time can see our line up. Spying can be annoying but is now easily avoidable with white-list.