It is about becoming a blip on the taxation radar. Some say it is to protect the consumer from unskilled labor. Years ago, in another life, I was a licensed trade contractor. The test material was so antiquated, it gave me a chuckle. My specific field had moved light years ahead of the techno-snapshot demonstrated by the test content. The safety aspects were cursory. Meanwhile, the taxation/pecuniary obligation section was razor sharp and current.

Ultimately, it was obvious that the purpose was for the State to identify whom to tax. I left the industry in an economic evolution.