Most are staying, but there’s a growing shift to simplex among privacy/anon focused people
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Signal uses closed source and centralized servers to deliver all your messages. Some people don’t like their communications being dependant on a corporations computer, and would rather maximize data sovereignty when possible.
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phone number requrement is unacceptable to some people
If SimpleX makes bad choices it can be forked and self hosted, whereas we would be locked in with signal and at the compamys whims
Mullvad VPN has DAITA which does something similar but more legit