The Rubber Plantations were run as corporate states, and 10 - 15 million people were killed. One of the biggest mass murders in the history of Colonial Capitalism.
Roughly equal to the numbers caused by the British East India company when they caused various famines in Bengal and India by exporting all their grain.
The Official title of Taiwan is The Republic of China.
They still allowed the KMT (aka The Chinese Nationalist Party), to participate in their Democracy even though it ran the country as an anti-democracy Authoritarian state for 40 years.
Taiwan and China do a lot of trade together, a war would be difficult for both of them.