In dusty factories, cramped internet cafes and makeshift home offices around the world, millions of people sit at computers tediously labelling data. These workers are the lifeblood of the burgeoning artificial intelligence (AI) industry. Without them, products such as ChatGPT simply would not exist. That’s because the data they label helps AI systems “learn”. But despite the vital contribution this workforce makes to an industry which is expected to be worth US$407 billion by 2027, the people who comprise it are largely invisible and frequently exploited. Earlier this year nearly 100 data labellers and AI workers from Kenya who do…