For your information, it actually is being made by the DOJ, just not on this lawsuit.

https://www.justice.gov/opa/pr/justice-department-sues-googl...

The press release doesn't mention it, but the actual court document asks the court to:

"Order the divestiture of, at minimum, the Google Ad Manager suite, including both Google’s publisher ad server, DFP, and Google’s ad exchange, AdX, along with any additional structural relief as needed to cure any anticompetitive harm"