How does the government determine whether something creative like hair dressing is at a good enough standard?
Edit: changed mostly to ostensibly, because of comments below.
It's about making it harder for people to compete with the existing hair dressers. It's about forcing students into schools. It's about extracting rent from the economy.
https://www.huffpost.com/entry/cosmetology-rules-show-ab_b_5...
https://reason.com/2016/08/03/do-you-have-a-license-to-braid...
Just because someone is compelled into an arrangement they speak against doesn't mean it's hypocrisy.