

A global government would prevent this from ever happening.
A few elites have the power to inflict violence on everyone else and get away with it - aka the state’s monopoly on the legitimate use of violence. This allows them to enforce injustice like unlivable wages but also to starve, jail and kill anyone who is serious about taking aware their power.
Setting up a global union would drastically curtail the power of elites, and they would prevent it. You would have to defeat the world’s elite, and in that case a universal wage is small potatoes.
CuntGPT, is that you?