They have been using the same servers for ads for many years. Ads are just YouTube videos with some special conditions, like you can skip them after 5 seconds and can't fast forward through them.
So why does YouTube-dl show no ads?.
It's not the spark that generated the interference. It's the high voltage needed to create said spark.
High voltage that is omnipresent in EV motor coils with far more energy behind it.
It's as much the current as the voltage. Remember it's Electro Magnetic radiation. It's the current that creates the magnetic component.
Interesting that pretty soon they are releasing a headset with integrated eye tracking where one promoted use is watching video...
By tracking eye movement they could save some data by not displaying image that would be in each eye's blind spot.
No man is an island if he's on at least one mailing list.