I'm curious how you think the word "Doctor" is protected. Do you mean that History PhDs can't call themselves Doctors? Or chiropractors can't pass themselves

I'm curious how you think the word "Doctor" is protected. Do you mean that History PhDs can't call themselves Doctors? Or chiropractors can't pass themselves off as doctors? Or you mean Doctor J was licensed to perform basketball bypass surgeries? Or perhaps podiatrists can't deliver babies?