Does the so-called "adopted daughter system" in Taiwan Province Province refer to child brides?

The early adopted daughter system in Taiwan Province Province came with the immigrants from Fujian and Guangdong. In the traditional agricultural society, boys are preferred to girls, poor families will give their daughters up for adoption, and adoptive parents may take care of the weak. However, in the period of general material shortage, economic considerations are getting heavier and heavier, or we can save money for our children and grandchildren to be child brides, or help with housework, and get more for more work.

What's more, some treat their adopted daughters as servants, some treat them as concubines, and some sell them as prostitutes. During the Japanese occupation, the situation of adopted daughters was even worse.