Earlier quoted context omitted.
Instance banning is neither silent nor invisible. Every Mastodon instance has an About page (no login required) listing all instance bans and reasons, anytime. I would be in agreement with you about silent/invisible censorship, but that's not what's going on here. This is a categorically different problem than MITM.
> Every Mastodon instance has an About page (no login required) listing all instance bans and reasons There are instances which require an account in order to see the bans (cyber.space). There are instances which do not list bans at all. There are instances with made up reasons of banning made up instances (mastodon.art). Even that flagship instance lists incorrect reasons for removing instances (claims that certain…
That can be a simple issue of jurisdiction. Mastodon.social is hosted in Germany (IIRC), so they have to adhere to German law. That means, for example, while hatespeech isn't strictly illegal in the US, it certainly is in Germany, it even has a fairly good legal definition. Or take the Japanese instances, which aren't well federated or have media-bans because of differences in media legality. And lastly it can also be simply the case that the instance is not moderating (ie, they write 'no illegal content' but do not care).
Both the statement that an instance shared illegal content and that the same instance was banned for illegal content can be true at the same time.