I just don’t see it happening. Shit I have a hard time getting them to use god damn Whatsapp or Telegram (still bad but at least better than Instagram).
They are all iPhone users in the US so as you may expect they are too damn lazy to install another messaging app despite having Instagram Snapchat Tiktok BeReal and whatever shitty social media app that exists on the App Store.
For the love of god don’t just say “you need bettee friends” 😂 cause let’s be honest finding a privacy conscious person that you also can get along with in the US as Gen Z is practically impossible.
There’s no easy receipt. Crunch them one by one. Prepare good (and simple!) reasons why the alternatives aren’t acceptable for you.* Start with people you message daily. If someone only receives one message from one person once in a while, they won’t stick for sure.
Try to migrate group chats, after some fraction of people agreed to try it out. FOMO will make the people to check the app.
If you have the most important people convinced, delete WhatsApp and Telegram and stick with it.
I moved from WhatsApp when Facebook bought it. I was able to move most of the people to Telegram (wouldn’t choose that today anymore). Now, WhatsApp is just off the table. If someone ask me for “my WhatsApp” and isn’t willing to use one of the options I offer (Matrix, Signal, Telegram, Threema), I use the inferior SMS, call or (extreamly rare) email. That’s the deal, take it or leave it. I’m not willing to use a messaging app from one of the worst companies acting against many of my principles. If you can’t respect this, we won’t stay in contact. Period.
* Edit: collection of bad press as a reference can help.