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In the current times Signal is the only viable way on mobile. On PC Matrix is a good alternative for chatrooms with friends.
I use Element on Android to access my Matrix account, keeps everything on one network for me that way.
Why Signal over other alternatives like Telegram?
Signal is mainly used by the people I communicate with. The Founder of Signal is also a known Computer Security expert. The signal protocol itself is also used by WhatsApp, Google Messages and Faccebook Messages.
I just had a look at the telegram privacy policy (https://telegram.org/privacy#8-who-your-personal-data-may-be-shared-with) and compared to signals privacy policy (https://signal.org/legal/) telegrams policy is just not for me.
Whats wrong with Telegram one?
Their company construct and data sharing within that construct just doesn't align with my values.
It isn't e2e encrypted. I think they use some form of roll your own encryption and the server theoretically can access the messages. Signal is just better from a privacy perspective.