I’ve used SimpleX a little bit and quite like the concept. The biggest challenge is that it is not well known and almost no one is on it. Also one of its privacy strengths, no phone number, is also a huge weakness in spreading adoption. At work me and my colleagues use Signal and have been for several years. But getting everyone onto signal was pretty seamless due to how easy the phone number system worked to link everyone together…would be a big lift to move to a new app.
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