Gents,
I can ensure you that bots are used in GvG. We have that problem now in Portuguese server (Brisgard world), where a guild named BIA started to use maybe a couple of months ago, basically excel macro developed to be used in GvG but now seem to have even better Bots.
We complain to support that gave us the usual answers (already commented here), but besides that we make available to support the tool they were using, how they were using it, who, and even print screen of private talks among them in discord sharing and optimizing "the tool" (we had a contact inside that rebel against that practice and share the info). And guess what the support did??????? yes, nothing!!!
You can find basic tools of this kind and download them in internet .... example go to google and search "gs auto clicker download" ... and you will get a tool.
I believe is easy for support to detect, although not to check it and so prove it, but let´s face it when you have a guild sistematicaly siegeing a setor in less then 0,1sec with no failures, that should be enough to ban some players.
In this specific case in our battle against them we move from a position they were not able to harm us in a severe way (although some effort was needed to control them) to a position were we basically could not make any important setor .... not even a chance. Same guilds, same players from one week to another.
The effect of using the tools is that if you have a good computer and connection (and they have some players in that condition), to normal players that don´t use it, even with good computers and connection there is no change to insert new defenses as an exemple. You just see one siege over the other without seing the orange arrow, you simple have no chance to do it.
The reverse is also true, we have good people that is fast putting the siege, but if they need they always replace defenses ...always, no matter how fast we are.
Again, not easy to prove, but just see how fast it is and you see is not human speed .... just need to do something, and don´t think Inno want to .... B world in portuguese server starts to look a ghost world .....