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Signal and Threema want nothing to do with WhatsApp
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
Except most people are not going to tolerate having a multiplicity of apps, and if people in your circle don't already use signal, they definitely won't now. Whereas previously, I was getting pretty decent traction from people slowly adding it.
In the modern age, it's getting easier to hard-line your messaging platform though.
If people are already used to having multiple messaging clients for multiple people, it's less of a jump to add one more.
This has been my experience as well. In the past friends and family were more reluctant to break away from whatever their default communication app was. These days most people are already familiar with the idea of using one thing to text, another to "message", and often more than that. I've had great success converting people to more secure platforms now that they understand the process.