Republic of China used to have a law like this till 1980s. Every overseas Chinese can migrate to Taiwan as long as you can prove yourself of Chinese descent. You get your citizenship within a year upon application and staying in Taiwan.
This was Sun Yat Sen wishes that every Chinese ( specifically meaning Southern Chinese ) should return home one day to rebuild the motherland and we Nanyang Chinese were the "mother of revolution." The funds for Tong Mei Hui uprising against Qing mostly come from overseas Chinese in Southeast Asia, North America and Japan. HK and Southeast Asia contributed many men for those uprisings from 1905-11.
That's why that law was made - expressing gratitude to overseas Chinese.
good to hear that! i think i miss out on this part of the history. thanks for sharing. my friend got Taiwanese wife, maybe will check with him.