> How is that different from e.g. cars? The roads are a public good as well, not? For one thing, it's different because there is no law that cars need an activ

> How is that different from e.g. cars? The roads are a public good as well, not? For one thing, it's different because there is no law that cars need an active transponder while operating. But cars do have a license plate anyone is free to look at while they drive by so in that sense it's the same.