I, too, received an email on Oct 20 advising of a refund for reason of "fraud". It's my most downloaded image, so I have to agree the reason for downloading is most likely to steal the image for sale elsewhere.
It would be nice if DT could reassure us that they are doing more to pursue and persecute such buyers in addition to taking back their commission.
All the reassurance I'd need is knowing that they would foot the bill if the fraud does occur.
This would ensure that they did their best to prevent it!
If they can't afford to safeguard our work then they are undercharging their customers.