Biden passed some of the toughest anti-trust laws in the past 20 years, but Trump repealed them quite literally in the first month he returned to office, calling anti-trust legislation as "bad for business".
You mean via executive order? That's not exactly passing a law.
The whole dance is really effective at keeping the administration one or two steps ahead of the judiciary and legislative branch.
It's also more or less true that the Biden administration took more responsibility and initiative in antitrust enforcement:
https://www.americanbar.org/news/abanews/aba-news-archives/2...
https://www.wbur.org/onpoint/2024/10/02/biden-ftc-antitrust-...
https://rooseveltinstitute.org/blog/the-biden-administration...