No point squabbling about earth straps really. As previously posted, it was a Spectra line so no conducting capability that I am aware of.
However, risk of thread creep aside, I started my career under helicopters attaching loads. Static electricity was just something that you took as part of the job, and the same for the countless loadies that have worked under me since. Never have I used, or seen any other pilot use, an earthing strap.
Does that make me some sort of dangerous operator? Is the static electricity so great under some machines, large ones I'm guessing, as to be a hazard rather than just a discomfort? My personal experience only goes up as far as 3500kg AUW.