So that example doesn't really hold up.
As a user in a closed ecosystem like Twitter, you have no control over what content will be served to you (the same goes for any filtering tools said ecosystem offers it's users). The state of a closed ecosystem today, does not guarantee that there won't be future state changes (and users have no control over those).
With a protocol like RSS you have full control over the content being served up to you. If a source you previously agreed with and enjoyed, starts souring for you then it is as simple as unsubscribing. It will not be pushed on you.
So as said before, the example doesn't really hold.
Twitter might some day remove the block button? They might some day push certain people on you, without recourse? Therefore, they have to ban these people now?
Rather it was an attempt at an simple example to explain to you the differences in control that a user of an open protocol has, versus the control a user in a closed ecosystem like Twitter has.
Think it didn't land.
Twitter has started to let you control who can reply, but that removes some serendipity, so if everyone worth following does that, Twitter loses value.
They say the only want to ban Q, Alex Jones, and conspiracy types but then you look at sites like Reddit who have adopted this moderation heavy approach and it's slowly becoming one giant mono-culture where the set of bannable wrongthink only ever grows larger. It's highly selectively enforced and usually does little to stop people from actually having opinions they don't like.
It's based on an ideology that treats people like sheep who can be fooled by selectively showing them information and guide them towards holding the same opinions as they do. And they want unaccountable tech companies to be the ones with this power.
Well, marketing empirically proves this to be true...
twitter limiting direct personal threats would be a welcome change.
This is about not wanting the "other nutters" on there along with "our nutters". Which will make things worse in some ways, so keeping it confined to one set of nutters is not without its merit.