In the beginning, it was just a game. One we've all played numerous times: select the squares with a stop sign, enter the text below, reassemble the puzzle — and check the box declaring, "I am not a robot." Yet, every time we select images determining whether what we see is a cat or a croissant, we end up working for  Big Tech . When Guatemalan computer scientist Luis von Ahn first proposed the idea of "games with a purpose" (GWAPs) in 2004, his goal was to harness human brainpower so that