Just because some regulations that you would like to exist, but don't, doesn't mean there aren't regulations that exist, but shouldn't. I'm most US states you need a license to cut hair. I'm summer states you need a license to braid hair. These licenses are actually expensive and hard to obtain, keeping a lot of talented people from actually working in the field. I bet in China you can just cut someone's hair.

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.