Leaving Whatsapp is hard because everyone is using it. But suppose whatsapp becomes unavailable for whatever reason, people will turn to other apps within hours

Leaving Whatsapp is hard because everyone is using it. But suppose whatsapp becomes unavailable for whatever reason, people will turn to other apps within hours (actually within a hour). In fact many people already have Telegram/Signal on their phone (although not using it). As for instagram, things are a bit different. But the way I see it, 1- general population isn't using it. 2- This is not a necessary tool like whatsapp. Something else will fill the void but it will take some considerable time.