Yes, as with any protocol email is always subject to centralizing forces. But protocols like email (to me) represent the best possible approach to trying to counteract these forces for Internet applications. They aren’t a silver bullet but maintain the best forms of optionality for undermining and correcting them.
Lol yeah so you are talking about a cryptocurrency but actually afraid to use that word. I know, I just did in my other comment and I know I will be attacked here.
We have many such systems being developed, but you get downvoted on HN for promoting them, since people assume you are a scammer, a criminal, etc.