Telegram for family, friends, work and actually for everything I can think of.
Discord for gaming with friends, not as a messenger but as voice comms mainly.
Whatsapp for very legacy stuff, haven’t had a notification in a couple of years. Maybe it’s time to uninstall, finally.
They need a new enemy every now and then. If the current enemy happens to be exterminated, they’ll need one sooner, but they’ll need a new one anyways.