What year is/was the car on youtube? If newer there is probably a small fuse inline with the starter relay.

Modern card have more computers but also have better protected electronics. In the early days a transistor was simply a transistor, now inside that little package there are regulators, surge protection, etc so the components are made tougher. Also since the 70's the rubber in car tires now has metal added to make them conductive so the car is somewhat grounded.