On the other hand, just because you can point to some regulations that exist, but you rather wouldn't, doesn't mean that regulation in itself is bad.

99% of cases, we started out without regulation, but then something bad happens what made us create the regulation.

In china everybody might be able to cut hair, but also anybody is able to drill water wells, and cause massive sinkholes and subsidence all across china. In china you can pollute all you want, and the citizens just have to deal with warnings about toxic air outside on the weather forecast.

Also I'm sure that if you were to ask an actual barber about that licensing they would be able to tell you plenty of good reasons for why that exists. It's not entirely impossible for a barber to screw up somebody's scalp when bleaching their hair for example.

I ask every new barber I use why the regulation. The answer is the same every time: "You don't want your ear cut off by accident". But I know why the regulation exists: it's to protect existing barbers from unlicensed competition.