Expecting the US government to properly handle monopolies and anti-trust issues is a fool's errand. It's like saying the US government should solve the issue of gun proliferation in the US: it's simply not going to, in our lifetimes.
I googled "us government anti trust wins" and found a few articles that point out some recent ones, e.g. Adobe and Figma in December 2023, and an Apple lawsuit in March 2024.