[vinylweatherman]

So, Neteller can breach their own T & C if they feel the need - just like a casino.
Since Neteller have established this in practice, this term could be challenged in court by any player wanting to seek redress from a rogue casino. While the rogue casino would laugh in the face of any court threat, Neteller would be named as an accessory in the action along with the casino.
Judgement would be made against the casino (if the evidence presented warrants it), and Neteller, as a UK regulated company, would be required to recover the money for the player, as they have demonstrated they can.

One way to force Neteller to respond on this, as they seem unwilling to give a straight answer, is for someone who has actually been a victim of this to complain formally, quoting this very term, and asking Neteller to comply with it.