The CCP is known to be very aggressive. Even if the founders acquired Singaporean citizenship (which is way easier for ethnic Chinese people than for other races), the CCP would have taken them hostage if they just set foot in China like for a business trip. They can invent a crime and subject them to a trial with Chinese rules. What can Singapore do? It’s a tiny country that tries to walk a tightrope by simultaneously maintaining good relations with both China and the U.S.