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Time to get serious with E2E encrypted messaging
(techcrunch.com)
This is a most excellent place for technology news and articles.
Unless you start an encrypted chat, Telegram chats are not E2E.
Host your own Matrix node, and then you don't have to worry about prying eyes. Realistically, instead of worrying about the protocol, worry about the content of the text. Use PGP to encrypt your own text and send it over clearnet. Who cares at that point.
Definitely host your own node! It's trivial for a server admin to add a hidden bot to every chat and while it's still E2EE, an unknown party could still have a copy and key to read it.
Really good talk from DEFCON 32 about the service "Anom" by Joseph Cox (sorry for the lack of a link, at lunch, on mobile and about to get back to work).