more accurately, poverty wages in original countries of many foreign teachers. Obviously, it is not a poverty wage in Taiwan for most of foreign teachers as well as local people.
I don’t think NT$40,000/ month is such bad for a year of experience in Taiwan for non licenced young people.
They are college grads who are supposed to equip skills to collect and analyse relevant information to make their proper judgement, and decide to sign the contract by their own will.
I agree there should be a licenced teacher as is supposed, though the 40min may be supposed to be a time to experience native English and English speakers. I’m not sure if it is so unfair to the students.
in general, volunteering is not illegal on a student visa.