Are you nuts or just misinformed? China is investing everywhere. Africa, south America, Russia, EU. And they do have immigrants, as a Western person it’s actually quite easy to move there to study or work. Lots of Europeans I know have studied and worked in China and Taiwan.
Pretty sure OP meant mainland China only, excluding Hong Kong, Macau and Taiwan.
Easy or not is hard to argue, but more foreigners live in Taiwan than the whole mainland China.
Taiwan is not part of China.