I once worked in a hardware lab that used wire shelving for holding arrays of running machines, and a bad ground running through one chassis caused anyone who touched the shelf to get shocked by something very close to line voltage.
That shelf is more glue and fire retardant than it is wood. Its also really bad as a book shelf so it might still be superior in this role than the intended one.
It depends on the loading. If you've got it 9-12" high apart and are putting paperbacks on there... that shouldn't be a problem.
However, when the shelf becomes multiples of that, then people start putting hardcover volumes or laying the book flat and stacking them high within the shelf.
It won't necessarily fail, but it can substantially sag with heavier loads.
This is an issue for boardgammers who are after larger and heavier shelf spaces which is why the Kallax shelving is much preferred. I'll also note that Ivar shelving is solid wood rather than particleboard.
The rack itself won't hold electrostatic charge, and if the devices themselves want to be grounded they can be grounded through their power supply
And wood isn't that easy to get to burn unless you turn it into small particles first