It's impossible for them to treat competitors' ads different from their own. That chrome update wouldn't have time to download before they got dragged to court by every ad network, the European Union, and the Department of Justice.
The DOJ has clearly given up the ghost of even attempting to regulate US companies, and the current political news is just more evidence in that direction.
Google can draw out these lawsuits for decades while continuing their practices with impunity. They already have two incredibly well studied playbooks to draw from: Microsoft v DOJ and SCO v IBM.
