At this stage I just have to show I sold ETH for less after the 29 Jan 2018 (when Ad Ban started) than the price before that date.
There is no defence of good faith available.
Or indeed any other defence.
They should have sought authorisation from the Competition Regulator and they didn't.
In any case the amount of scams is wildly exagerated and based on little or no evidence. They banned the legit industry and let the scams through.