The voltage on a USB charger is only 4.2 volts and a max of 2.1 amps. This is extremely low lower and unless released quickly with a capacitor will not really spark.
Small electronics, by design, operate on a tiny bit of power, most of it going to the screen. The batteries can get very hot and burn even but to get a spark your need quite a bit more voltage.
There is not enough current running through the cable to make the jump through the air and complete the circuit. If there were, this would be extremely dangerous and you for example, could not plug in a charger and leave the cable sitting on a metal table or near anything metal, lest it start arcing.
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