Sounds like they just don't care about privacy, do they?
Guess showing them https://i.redd.it/0imry50rxy961.png still won't change anything..
A few of my neighbors have kids the same age as my kids, they're on a WhatsApp group chat, and my choice is either use WhatsApp or make my kid miss out on social events, so it's not really a choice.
"Hey let's switch to this app that nobody else is using and it sends you annoying popups every month but trust me bro it's more secure" is not a winning argument