Comment by IggleSniggle

I don't think that's quite what happened. Google got in anti-trust trouble because they have an unfair advantage in user-tracking, given logged in Chrome accounts. Removing third-party cookies hurts other privacy-invading companies without substantially affecting Google. It was still somewhat on track to be removed from Chrome until they lost their antitrust battle, and Chrome was required to be spun off. With Chrome's new future, and Google's new legal constraints, there's less incentive to try and make Privacy Sandbox work. At least, that was my understanding; I didn't follow it all that closely.