Although the US has the world’s largest reserves of Germanium , they are not producing it in a large scale. In fact, it's not that these two elements are exclusively available in China , but the most important factor is cost of production.
Gallium and germanium are primarily extracted as a side product of Aluminium smelting process, in other words, they are the “ production waste”.
hartamas : good article
72878051 : The impact is far-reaching, at least affecting his production and costs.