I truly believe that Telegram did bring some major changes in our field with its easy adoption and cozy security and privacy settings.
However, for how long can cozy settings dominate our field when HOT user friendly settings regarding privacy are here??
Actually, Telegram isn't secure [
https://security.stackexchange.com/questions/49782/is-telegram-secure ]. Personally, I use Signal or WhatsApp for the end to end chatting applications. I need to learn the reference you stated about Ravn & Korrax, it could be interesting.