It's of course best to avoid ranting about stuff that will make you sound like a conspiracy nut
When you ask them to do this, the next question will be "why?" and I don't know another way to answer that.
I've gotten comfortable enough to tell them I don't use that stuff. Sometimes I joke and say I'll give you my email. Most take it.
So it sounds like you probably never speak to those people again.
By the way, what is your preferred platform for private communication?
SimpleX