Ethic Chinese disguise their roots with weird names like Soeryadjaya to blend in with their dangerous hosts.
Economics was a major part of it. Politics played its part, too. The Communists tried to organize a coup and the reaction did not stop with the dead and captured actors. It was an excuse to capture the Chinese money and eliminate them from positions of power and influence, social as well as political. Henry VIII’s move against the Catholic Mmonasteries and Catholics generally came from the same desires. The Catholics controlled much of the wealth in Britain and Henry was broke. That move also served to detach Britain from the Continent. Suharto detached Indonesia from the Communist enterprise while getting control the resources. There is not much new under the Sun.