That's certainly possible, anyone can walk into a Home Depot and buy a breaker box (which is certified) and install it themselves (well or badly), but realistic

That's certainly possible, anyone can walk into a Home Depot and buy a breaker box (which is certified) and install it themselves (well or badly), but realistically that doesn't seem to happen so often it's a serious problem, partly because we have home inspections to catch the unsafe botched attempts (when they try to sell their death-trap homes).