How can brokers off BTC CFDs?

[aylwood]

Apologies if this has been answered previously. A search revealed nothing...

I've noticed a few brokers offering BTC CFDs.
http://www.plus500.com/Instruments/BTCUSD

Anyone know how they are hedging their risk?

Is someone else offering BTC options or futures?
If so, how are they hedging their risk?

(It's not as if they can correlate BTC price movements to other commodities/currencies, which is how traditional hedging occurs.)