Signal
Seeing lots of posts about people using #Signal and trying to get friends and family onto it.
This might not be a good idea, here's why:
-Signal is centralised.
-Centralised services are difficult/impossible to leave, because of the network effect.
-Centralised services can be sold to other people without warning.
-The guy who runs Signal is a billionaire who sold WhatsApp to Facebook in 2014 (that's how he became a billionaire).
What will you do if history repeats?
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Signal
One thing I would add is you need to tie it to a phone number which is a big deal to me. XMPP; Matrix or Session would all be more secure options.
