I mean there's Signal, but Signal's desktop app is absolute garbage (the mobile app is pretty similar to Telegram), and you have to give your phone number. I tried Session for a while but it isn't really catching on.
There was Status.im but I think that got killed off or something. I'm also looking for alternatives right now (funnily enough, I started this a month back, just from a gut feeling that someone was going to happen to Telegram).
EDIT: Also there's gurk-rs for Signal for tui fans (such as myself), but it's a bad UI, basically cramming a graphical interface into a terminal app. And won't display images of course (no icat support afaik), and with the few normies I keep in touch with via Telegram, images are an integral part of our conversations.
Stay away from Signal, it's 100% glowie app. Look it up on here, I'm sure there is info on it.
You give your phone number. The sessions don't record (AFAIK) any of the data you send, but you're identified as using the service.
Credit reporting companies use your phone number to identify you, so it's easy enough to tie number to you.
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