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There is all that crap, and then there is https://sphinx.chat/
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Signal, of course
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Yes, currently it's the best option. The need for mobile number is really annoying though and breaks privacy if you want to join groups with many people.
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Nostr (anigma.io for example) Matrix (Elements app for example)
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Neither is great for privacy... Matrix is leaking all metadata, server has full view and a lot of groups are public anyway.
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Then probably Threema but it's hard to get people to use it as it isn't free (Can be paid with Bitcoin)
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Signal is good
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