Uber publicly admitted they built it, that they were still using it, tried to defend its use (for driver safety), and then, a week later, reversed themselves & agreed to stop using it to evade law enforcement, "going forward."
I cannot imagine why Uber chose to admit all that. (Well, other than there were at least 50 people who worked on Greyball & who knows how many more knew, so maybe there was not much choice...lying wasn't going to cut it & lawsuits were already certain) Nonetheless, its a lot of admissions.
Here's the thing: there are legitimate uses for Greyball (driver safety, as they asserted), but evading law enforcement, which they've now admitted, is not one of them--and, as said over and over, is obstruction of justice.
Uber'll undoubtedly try to defend Greyball on this basis (that there are non illegal uses for it--and that was the overwhelming majority of what it was used for)...it wouldn't have worked but, now with their own reversal & public admissions, it'd be hard to even make such an argument)
anyway, here are a few links about Greyball & Portland: