Make it possible for the one that drops golems to lock it towards the guild represented only and also that it can be unlock. So when locked only guild members can get in, and unlock anyone of the server.
Whether it is certain spies or whether is it just a random can’t go running around with golems out of a keep and run them of a cliff or make sure opponent can just destroy them. This way less influence of any spy would be there as well as Anet doesn’t have to sort out any blame mail about so called spies from other servers.
It might make less corruption in wvw possible. Until someone sees a loophole in it