100% monitoring and control doesn’t exist. Your children will find a loophole to access unrestricted internet, it’s what they do.
Similarly, children will play in the street sometimes despite their parents’ best efforts to keep them in. (And yes, I would penalize Ford for building the trucks that have exploded in size and are more likely to kill children, but that’s a separate discussion.)
I get what you’re saying, I just think it’s wrong to say “parental responsibility” and dust off your hands like you solved the problem. A parent cannot exert their influence 24/7, they cannot be protecting their child 24/7. And that means that we need to rely on society to establish safer norms, safer streets, etc, so that there’s a “soft landing” when kids inevitably rebel, or when the parent is in the shower for 15 minutes.
I have an air compressor which is powered by the 12V DC outlet in a car. They are quite cost effective and easy to buy. I use it all the time to refill my tires. Much better than some odd exhaust pressure solution.