I still think this whole idea that we were going to get big tech (or anyone really), as owners of the modern mediums of communication, to act as the arbiters of truth and harmful messages was always a ridiculous notion. It's both not in their interests and not in their power.
The mainstream of the liberals and the left seem to have become so obsessed with policing speech that they've nearly completely given up on meaningfully improving the material conditions of people's lives. You win the narrative by delivering real results that people can see and feel, not by trying to ban charlatans from spinning bullshit.
Change the world, and the narrative will follow. Not the other way around.
I really don't think so. If the process was so simple as writing false or hurtful things, and then your political opponents are blocked from power, then why doesn't the left just become a bunch of shitposters and kick all the fascists out?
I think a more plausible explanation for why the left has been excluded from power is simply that American politics runs on donor money, capitalists have lots of money, and they have a class interest in excluding the left. You can certainly get deeper than that, but that's sort of the heart of the issue.
Note here that Zuck and Meta are capitalists, and were never going censor the narrative contrary to their interests.