Mastodon isn't as simple as the model he imagines (simple click-boxes to select what kind of messages you want) but it does give you moderation (on your local instance) while still letting you avoid censorship (by moving instances if necessary).
Unfortunately, Mastodon rather than doing that, gives complete control to the server administrator to "moderate" their instance. The result is that you end up having isolated echo-chambers, with each server blocking all other servers that don't agree with their viewpoint.
You can also see censorship as about being able to control what people will be able to say to you. The fediverse is not at all resistant to that.
That is, nobody can stop you from setting up your own instance, or write your own ActivityPub implementation, or find one that tolerates whatever thing you want to say.
But we can band together and prevent you from making us party to your conversations against our will, and we can prevent you from being part of our conversations against our will.
The structure of the fediverse supports that by letting groups pick instances whose moderation fits what they want, and different groups with different moderation requirements or even contradictory moderation requirements can co-exist without all being beholden to the vagaries of policies set by a third party we have no control over.
This is Robber's Cave experiment [1] all over again: A society that does no longer talk with each other and is segregated (e.g. along political lines) will at first become hostile between different factions within it, and eventually break.
Filter bubbles ultimately destroy civil society and democracy.
Talking to someone with another viewpoint, even if that viewpoint is a stupid or hateful one, does not mean endorsing. This is not about "fair and balanced", it is about communication and providing ideas outside of their peer group. Now, if you decide to just block flat earthers individually, or as a group (even for non-flat-earth-related communication), you will just create a filter bubble for them in which they can strengthen their now-unchallenged beliefs in.
There really are flat-earthers out there who are easily persuaded by just walking them through an ancient math problem. I've seen it. It's the same way someone who has really bad opinions on marginalized people they've never actually encountered can quickly change their tune by meeting the subject of their ignorance. They're not the ones who collect on the instances that feed off deep, unmovable ignorance.
How would you know, given that those other instances are, you know, blocked?
> who really are curious
Trying to guide the neutral ones into your camp is not a discourse - it's campaigning. In a perfect world we can disagree on topics, and everyone leaves the interaction still disagreeing, but maybe just understand the train of thought of the opposing side.
> with a skim of their timeline.
I've stopped doing that, because all too often, what I find is easily taken out of context and will make people look too "nice", or too "bad". And creating a complete dossier on everyone I interact with online is just too time-intensive.
> They're not the ones who collect on the instances that feed off deep, unmovable ignorance.
Funny how all the blocked ones always seem to be the undesirables, the ignorant, the weird, the stupid, the evil, the ugly, the disease-bearers, isn't it? Of course, wherever we are, the sun shines, everyone is reasonable and happy and friendly to each other. Of course, more often than not, that's not the case. We like to paint the other side as demonic caricatures, because it helps with in-group cohesion.
I don't think guilt by association is a concept that we should keep reviving again and again and again... especially since it appears to me - after having gone through several Mastodon instances - that there are no "normal people instances", that any instance is either radically "free-speech", or it is radically "safe-space".
If anything, having means by which communities can separate partially without needing to fully isolate (e.g. if you don't like Twitter's moderation policies your choice is to cut yourself off from Twitter; if you don't like fediverse instance X's moderation policy, you can pick from several thousand other instances with varying degrees of concordance with or opposition to X's moderation policies, most of which can still federate with X) gives an opportunity to reduce those bubbles.
https://fosstodon.org/about/more#rules
It's also selective about which other servers it will interoperate with and how much:
First he whined about advertisers leaving. Then he threatened to publicly shame them. Then he asked for feedback, got some constructive feedback from some huge ad exec, and promptly blocked him.
He appears to have messed with AOC's account because he didn't like her arguing with him.
He already seems to be reversing on his free speech ideals and is instituting permanent bans that he said he was opposed to.
I don't know what's up with him, but it's hardly a shining example of reputation management that's for sure.
And it's been what, a week?
See my other comment in this thread for my story.