I'd been thinking Telegram would be a sufficiently secure alternative, but as Western intelligence gets their hooks into that system I think we need to go self-hosted. Element is the biggest name here, but I'm curious what options are the best for a combination of both security and feature maturity.
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Just take note that Matrix was originally developped by Amdocs, an israeli multinational with ties to the state intelligence. They made a foundation to pursue further development, but apparently the staff is the same. It might not mean much, but many people don't know about it.
Matrix also also really, really bad when it comes to metadata. I would not trust Matrix when it comes to sensitive things or communication that can be used against you due to how much metadata it leaks. I also find the double standard here were people don't trust Signal due to funding but ignore funding issues in Matrix.
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Element's theme can be changed too. https://github.com/catppuccin/element
I want to like Element, but the devs' refusal to implement multiple account capability is a constant source of frustration to me.
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Fractal is great if you use GNOME. Only downside is that it doesn't have a UI for spaces yet
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