Mark Zuckerberg, Sundar Pichai involved in ad collusion plot
theverge.com
theverge.com
Price isn’t the only dimension in an auction. Fees and timeouts would give a clear advantage.
There's also targeting matchup and ad inventory (variety of ads available for the impression). We see FB getting raked over the coals, time and time again, about how much targeting information they collect. THIS is where it would be leveraged.
Probably, the defence will drown the judge in technical minutiae to give up. Judge may rule that there is no case to save face instead of admitting lack of knowledge or willingness to learn.