My mother and other women her age used to give haircuts to people in college in the 60's for extra money. I guess they were all a bunch of criminals who deserved to do time, huh? What are you, a statist?
Friends is the key word in your argument. Selling your services to the general public, meaning complete strangers who don't know you but want some form of assurance in your skills, requires a license.
And it should. I assume that you want all illegal aliens to drive without licenses. What are you, a Mechista?