Wire that is curved has molecules on inside of curve closer together, or compacted, when wire was curled. Therefore most of power flows upon that inside edge. Think might be called curilian effect. Differnce isn't much, yet even small differences in resistance make big change in power seeking path of least resistance. mostly curl gets long wires out of way.
Also, Sell curly Wires to People With Curly Hair? yes,yes. Drashek Designer Statement: Never Sell Green Wires to people With RED Hair.

The cables are probably shielded.

Isn't uning "coiled wire" bad for the signal?

As in would not the Impedance (as in Ohms) be affected?

I remember something about induction also but I think that is only for power tramsmission not so much as with low voltage signals.

I also has think coiled wire is more prone to rfi/emi interference than straight wire?

I might just be crazy though beacuse at this moment I'm useing a set of headphones that have a coiled lead...