Also, sometimes, some activists can deliberately use a mailing list as a public expression channel because it is important that these things can be eared by everybody.
I see it as sticking posters in the street. There is no reasons to use Facebook or Google Groups for most of the Riseup (public) Lists users, not because they want something secret and hidden, but because they don't want to play with some companies rules and appreciate to be a part of a network run by volunteers more than to use profitable fake-free services.
Because it makes sense, not because it is more or less secure.
I see it as sticking posters in the street. There is no reasons to use Facebook or Google Groups for most of the Riseup (public) Lists users, not because they want something secret and hidden, but because they don't want to play with some companies rules and appreciate to be a part of a network run by volunteers more than to use profitable fake-free services.
Because it makes sense, not because it is more or less secure.