In Kenya, an invisible workforce is sounding the alarm. They work long hours in difficult conditions every day, sifting through millions of data points to power artificial intelligence systems. Yet they earn a fraction of their counterparts in developed countries, and they say the work leaves them traumatized and desperate. DW's East Africa bureau chief, Mariel Mueller, and DW reporter Yanosch Delcker have this investigation. A warning: This report contains content that some viewers may find