Censorship only becomes a problem when it is _unavoidable_, that is, you cannot choose to live outside of some entity's censorship influence. This is where things get complicated when you have giant entities like Facebook or Twitter, which are for many people difficult to avoid (and there certainly isn't an alternative to them).
The problem arises when these entities need to choose which messages to show you. Even without putting any conscious bias in this algorithm, there is a system there which prioritizes some messages over others in a completely opaque way, which is often game-able (bad-faith actors can abuse the system to spread their propaganda, for instance). So moderation is not merely necessary but _unavoidable_, simply because there is more content than you can be presented with, and unfortunately the huge power of moderating large social media networks rests in the hands of a handful of engineers.
Decentralization is an interesting solution here because it would make the social graph and the recommender system separate entities, with clients being able to choose which recommender/moderation system they subscribe to. The need for censorship wouldn't be gone, but with people being able to choose their own censor, the massive power imbalance is not quite as bad.
This will, I predict, make a lot of people unhappy because “omg there are Nazi tweets on my blockchain” but personally I’m happy with it.
I'm sadly not surprised. While HN does attract hobbyists like me interested in technology and how it affects society, it also attracts a lot of those who dream of building and controlling the next big data silo for personal profit. Permanently liberating an entire mode of communication into an uncensorable distributed system that can't be easily replaced due to the network effect (such as your example of email) precludes that path to profit.
Does it make sense business-wise? What business will want to be on a system that has no moderation? It's just asking for your brand to be accidentally or intentionally associated with undesirable things.
tons of businesses send promotional emails , even though they know the protocol is also used for sending porjn
You're posting this in a place (HN) that itself is not averse to deleting posts, shadow banning, manipulating the rank of articles, etc. Some have argued that HN is a good discussion environment precisely because of those things, though I don't necessarily agree. What I'm getting at is that you have reason to not expect sympathy for your position here.
The questions are where do you draw the line, and who gets to decide where the line is drawn?
I haven't heard of unsolicited CP being a common spam issue. And those who exchange CP intentionally can and do use encryption which makes such filters pointless.
you would call that a filter, like spam, and of course it's essential and can be deployed in multiple points (before sending, between servers, at the client). Both users and server instance owners can have control of what they allow. There is little disagreement that these filters should exist, so i expect all server to implement them.
Censorship is about allowing e.g. governments to request takedowns globally. most servers will reject such lists.
Dorsey wants a decentralized system exactly because he won't be held liable for not censoring people. It makes sense business-wise and it's a win-win for humanity.
Twitter has become a trigger-happy-people-fest because each group knows they can weaponize censorship against each other. With systems that are uncensored , nobody complaints, e.g. people don't make a fuss that email is not censorious enough