Telegram has voice chats now and Discord is just terrible privacy wise.
for a lot of people, nothing is more enticing than doing nothing :( 90% of my communication with friends is on a FB service (other 10% on snapchat)
I’m kinda talking out of experience too… I got friends to use Firefox on Android by telling them it supports uBlock Origin and got them to install F-Droid so that they can use NewPipe (a FOSS app that lets you watch Youtube without ads among other things) Also got a couple of them who use Facebook to try Frost out or Barinsta for Instagram… sometimes you don’t even need to mention privacy, you know?