Programming ceases to be a hobby for anyone and you can kiss the make community goodbye. There will be no more masterpieces out of left field and all programmers are factory workers.
Not being a Mechanical Engineers doesn't prevent building the car and putting it on the road, provided the regulations are met.
And if something happens to someone else with that car, the one building it is also liabiable, provided it was caused by a construction error.
However not having an Engineering license doesn't forbid it to being built.
Many programmers are factory workers, plugging software libraries, that is why open spaces are organized like the mills from industrial age, or the offshoring sweet shops exist.