> I spent a few weeks recently persuading two relatively large groups of non-technical people (50+ people in each) to move from WhatsApp to Signal
Yes, I had informally announced my network that I'd move from Whatsapp to Signal - which I already used - and was just planning to make formal announcement to all my contacts, and install an autoresponder (Watomatic) on Whatsapp with reminders to reach me on Signal. But I'm holding off now, not sure what to do. I haven't accepted Whatsapp's new privacy policy yet, so I guess will continue using that for a while longer. Considering if Matrix wouldn't be a better choice as my next default messenger.