I'm not saying it happened like that, but I could see it. A lot of ridiculous shit happens in the world and not everyone is a ration player here.
"Fake" British notes sounds like a pretty decent way to cheaply drum up some "good admin" points for them.
Sure they lose five pounds per order, but hell, I'd pay 20 pounds for four users who will defend you and your product's quality for quite some time.
It also would explain why he went dark.
The whole thing wouldn't have even been hard to orchestrate.
Oxygen admins wouldn't have insulted themselves the way GBPfakes did.