FTC/DOJ/FCC have different, and sometimes complementary, powers. DOJ is taking lead on Google right now, but don't forget FTC just fined Facebook $5B. DOJ may be at the forefront of this particular action because of Trump's grievances, but there's no reason to think Biden wouldn't go even harder, especially if we get Pai out of the FTC (praise be the day). GDPR has been a total wash, it will be funny to see the Americans actually do a better job with a far more constricted legal toolkit.