For any interested, here[1] is the late Milton Friedman's take on how we might protect against quacks, frauds, and snake-oil salesmen posing as doctors if government didn't step in to limit the supply of medical doctors in the name of quality control.

I realize it's not exactly what the article is discussing, but it's certainly relevant for all the same reasons.

This is during the Q&A of his lecture "The Economics of Medical Care", given to the very people who would most object to his ideas:

[1] https://www.youtube.com/watch?v=rWlk9HreE7U&t=2279s