No no no, mass surveillance or global surveillance means a surveillance at the world scale meaning that all the people from everywhere would be watched. They just want to gain datas about everyone, to one day maybe use it. Cover leaks, cover several things… For sure today you will not be under the control of a foreign gov but tomorrow if they need to they could track you to achieve their goals.

With the case of Discord, you probably should know that in China the big companies are really related to the Chinese gov. Take the case of Tencent and search online for share owned by the gov. That’s all. Datas trough Discord are not safe at all.