> I just tried to come up with a feasible example - maybe gas pipe installation would have been a better one?

The problem is any feasible example you come up with are already regulated, for the same reason you came up with it - there's danger to others!

Where I am, gas pipes, even inside your own house, can only be legally installed and maintained by a certified technician. You also have to get an annual clearance certificate done.

Just about everything dangerous is already regulated; further restrictions "just in case" are not warranted.