@Brookryn @DollyCat The point is, none of these apps are "secure", and the more people and groups you have in them, the more likely that messages will be leaked to your opponents.

In our pub debrief yesterday I was told about a WhatsApp group with dozens of UK groups in it, called TURN - Terf Underground Resistance Network.
They post their meetings and events on it.

Good luck with that, but personally I've never been on these things and never will be.