https://www.justice.gov/opa/pr/justice-department-files-anti...
https://en.wikipedia.org/wiki/Attempted_purchase_of_T-Mobile...
T-Mo/Sprint would have been blocked (and fell apart multiple times) if not for the Trump administration:
https://en.wikipedia.org/wiki/Merger_of_Sprint_Corporation_a...
I think you’re undervaluing the significance of the FTC’s everyday work, but I’ll agree with your the Federal government has not been aggressive enough in exercising its anti-trust authority.
The Sprint one was also DoJ, according to the wiki.
I get that the FTC on paper is supposed to enforce things like that, but their track record doesn't seem great. It just feels like a zombie agency that used to have teeth a long time ago...
Edit: I guess they've been squabbling for a while: https://www.cnbc.com/2019/09/18/the-ftc-and-doj-are-squabbli... but maybe are trying to work it out? https://www.ftc.gov/news-events/news/press-releases/2022/01/...
Then probably the next Republican president will come along and just got both their efforts all over again...