What ist the context here?

My threat model is not that big :)

My dad suggested me this after i told him about the new upload filters the eu is thinking about. Here is a link to a german blog post about it: https://netzpolitik.org/2024/anlasslose-massenueberwachung-frankreich-wackelt-in-der-ablehnung-der-chatkontrolle/#dokument

Is there e2e encryption available for mattermost that normies can use?

What clients will you use for xmpp/prosody?