Scale AI built its business on the labor of gig workers. But those workers likely won't benefit from their new deal with Meta.

OpenAI is phasing out the work it does with data-labeling startup Scale AI, cutting ties with the company days after Meta Platforms Inc. invested billions of dollars in it and hired its founder.

Meta is reportedly set to invest $15 billion to acquire a 49% stake in Scale AI, in a deal that would make Scale CEO Alexandr Wang head of the tech giant’s new AI unit dedicated to pursuing ...