I play EVE online, so I'm kind of desensitized to spying. Everyone spies on everyone, and there are master-spies who end up shooting themselves and collecting payment from all sides.
But the level of spying that goes on in there raises the bar for anyone who wants to run a player organization. having a in-house computer forensics man becomes a requirement. There are spies caught through IP traces on skype and clan servers. Major battles are sometimes won entirely by superior spying. And surprise executions of spies in the middle of battles are a routine thing.
Some of the larger groups also fund and encourage new spies to have their army of accounts to do their thing.
Groups cope with it by compartmentalizing their information. Give it out on a need to know only. Which leads to bureaucratic fun.
A game like Battlemaster with an average realm size of 20 people cannot deal with high-level gaming spying. Well most casual games cannot deal with high-level spying.
