I'm not 100% clear myself but I think that the criticism is that what was supposed to be a non-profit delivering world-changing technology for the public good was bullied/manipulated into a for-profit entity that would enrich investors and consolidate power among the wealthy.
So the "theft" is the wealthy stealing the benefits of AGI from the people. I think.
So the "theft" is the wealthy stealing the benefits of AGI from the people. I think.