Beware the hidden intentions of all sides.

Google (and the Silicon Valley behemoths): Currently know a lot of personal information about the citizenry

The US Government: Wants to know this information

Neither are necessarily deserving of or entitled to this information, so we shouldn't be cheering for either side.

Antitrust is less the issue than personal information / privacy / data tracking regulation. Antitrust enforcement is treating the symptoms, not the cause.

This is just a dog whistle for the political claim that search results, curated content, or algorithmic feeds are "biased" against a particular viewpoint of the world that they would prefer. Their intent is to use enforcement and investigative powers to make that case publicly and intimidate. The worst case, in their view, is to raise uncertainty about information sources; or, in the best case, to coerce more favorable rankings for their favored information sources. It's a furtherance of our state of domestic information warfare, while they remain in power.

Barr is notably for a surveillance state, more or less. Relying on a pick of Trump's to solve anything in the Valley is a recipe for disaster.