Only true p2p makes self hosting the trivial default - in fact there is no other way.
You download the app on your computer and you connect with other journalists directly and your readers download it from the p2p network too. There are no intermediaries. No "system administrators" that can lock you out of your account or data or censor you or edit your data, etc...
Journalists are sovereign and nothing can change that. Thats why p2p matters.