Big tech petitioned the gov't to label them as platforms instead of publishers, testifying that they did not make editorial decisions. We see now that that was a lie, and it looks like Congress wants to talk to them about that.
And Congress has always had the right to oversee and act against political censorship by the private media, which the Supreme Court upheld, due to the fact that political discourse is so important to the Republic. As a matter of fact, until Clinton there were laws on the books that limited one sided media narratives by limiting ownership of media companies.
Here's what's truly interesting. The left claim Russia interfered with our elections by running a few thousand dollars worth of political ads on social media. The left also cheers the social media platforms themselves interfering with elections in MUCH more sever ways.