That's not censorship, either in theory or in practice. "In theory" should be pretty obvious. "In practice" might require some explanation, because there seems

That's not censorship, either in theory or in practice. "In theory" should be pretty obvious. "In practice" might require some explanation, because there seems to be a meme going around about trying to have another discussion with a person in a room where there are a bunch of people screaming at you to drown out your words. While that might be considered censorship in that exact scenario, that effect does not translate over into the internet - you simply block noisy sources on whatever platform you're on and keep reading the content that you're interested in. For instance, even though Matrix and Mastodon are federated, you can block users (and even entire servers) from either local visibility or even federation with your particular instance. Similarly, nobody says that highly biased sites like the Verge, Vox, and the NYT are "censoring" opposing viewpoints because when you Google an issue all of the top results are from those sites with the same political bent - you can still craft Google queries that exclude those sites, one at a time.