Update:
We’re looking at adding some stuff in 7.3 for this if it fits in the schedule. Not just for Gold but the other resource types as well. It will probably need to be included as part of future updates as well.
I believe less than 0.008% of monthly active players are affected and the ones we’ve seen were all cheating if I recall correctly.
I’ve asked the team for further information so I can follow up on it more to ensure no one close to the cap are playing legitimately - in which case we’ll give them a headsup so they can spend their gold before they hit the cap.