They control what is left of the news magazines, and pretty much every other magazine, too. Only talk radio and the pesky internet lie outside their grasp, so that is where they seek to impose censorship.

But they have a problem: the First Amendment. The government can't suppress conservative speech on the ground that it is "hate speech," i.e., something that liberals don't like. That was recently reaffirmed by a 9-0 decision of the Supreme Court.

So liberals have outsourced censorship of the internet to the tech titans of Silicon Valley.
Unfortunately, most political conversation these days occurs not on the "free" internet, where independent sites like Power Line reside, but rather on social media–Facebook, Twitter, YouTube and so on. Other players include Google (in its search capacity), Apple, Pinterest, Spotify, etc. Happily–if you are a leftist–all of these tech companies are run by liberals. And because they are private companies, they are not constrained by the First Amendment.