Some contractors working for Handshake AI say the AI training startup has denied them up to several thousand dollars each for work they performed, after accusing them of breaking platform rules. Dozens of others who claim to have worked for Handshake have shared similar stories on Reddit, and the company has faced lawsuits from two contractors over withheld pay. San Francisco-based Handshake AI expanded from a job platform aimed at young professionals to the data-labeling industry . It's part