OK, and lots of liberals agree with that. The answer to unchecked monopoly power is to break up monopolies. Warren supported that.
The bottom line is I think we all agree that the problem is not that DP and other places can censor anyone they damn well want to censor. Getting rid of trolls, cranks, and open racists makes this place better, and if someone doesn't like that, they can leave and don't let the door hit them on the ass on the way out.
The issue is a few big platforms that wield too much power, now that they are seen as in some ways hostile to conservatives, conservatives want them regulated by Big Government. Well, maybe we should have DIFFERENT rules for the biggest platforms. That's an argument, but it's not a "free speech" argument. It's more of a public good argument. And even for those platforms, we would have to allow censorship because if not then the racists, trolls, bot armies and others would make life miserable for lots of users, and they'd flee the privately owned, for profit platform, which is bad for business and shareholders. So we need rules that allow for some censoring but not too much censoring, etc. It's a really damn hard thing to do, which is why the law as it is says private property owners get to regulate their own sites as they see fit.