I mean it’s shitty, but they are allowed to do it and probably should be allowed to do it. They aren’t a public space even if they like to pretend like they are. Opaquely slowing down access to sites they don’t like is pretty sketchy, but you can imagine if I started a Twitter competitor I might decide that I want to block outgoing links to sites spreading misinformation like InfoWars or something like that.

The government probably shouldn’t step in and force me to allow those outgoing links because I should remain neutral for some reason. It would be my right to control what content is posted to the website that I run. It’s probably more ethical if I tell people what I’m doing and why, but no one is required to be there.