Libertarians should support this: one of the legitimate, "delegation of natural rights" functions of the State is contract enforcement.

When you sign up for a YouTube or Twitter account, it needs to be in bright, bold letters either: when you post content, "we only publish a tiny handful of submissions, because we are legally liable for every word", or "your content will be shown unless it breaks the law."

Right now, sites like that-- and believe me, I'm a compulsive EULA reader-- give the impression to any reasonable person that the site is more or less a public square. Whereas in reality, the sites covertly-- meaning, contract violation-- curate content to a pretty extreme degree, and getting more extreme as time passes.

As regular readers know, I've been eagerly awaiting the moment when these companies need to choose-- because it will either make them disappear altogether in the former choice, or become BitChute or Gab in the latter. Maybe this executive order will be that moment?