Because everyone else they know is there. If the people they follow and interact with moved to Mastodon or switched messengers to Signal, you’ll see how quickly they will move. It’s hard to convince someone to sign up or install a new app if it’s only you they’ll find there. I was able to switch my family over to Signal and they literally use it only for family group chats, because they don’t know anyone else who uses it. And they were a little easier to convince because they’re family. I won’t be able to convince people with less close ties to me like friends, acquaintances, and neighbors.

Can't speak to the other apps but I have like 6 or 7 Discord servers that I'm actively involved in and a half dozen others I use sporadically. Even if I got all my friends to switch apps for our group chat I'd still need Discord for the servers I use and I'd rather not juggle two apps that are doing the same thing (actually already doing this with Discord and a text group chat and it's annoying as fuck). Also, switch to what?

Because on every occasion – at least in the case of Signal – they tried to switch, it was a far inferior experience for them, and the leadership behind the app/service took such puritanical decisions that it became evident that the ideology was more important than the people those tools were supposed to help/protect. I don't even bother asking my friends now. In fact, now, for me as well, those (Signal, Matrix, etc.) are just things collecting dust on my spare phone.

I had my wife and best friend using signal until they dropped support for sms. Switching between apps was too much for us.

Honestly, I've just made new friends. If I had to drop friends and family because they refused to move over, that's fine. I can just make some new friends.

People don't just stop using an app until there's very little activity.

Getting people to use a new app, especially one they have little activity on is inconvenient, especially if you're already checking WhatsApp, wechat, signal, telegram, LINE, Zalo, and discord because you have to many different friend groups.

I think for my friends it's just what we have been using for literally a decade since we were kids, combined with apathy towards privacy - although of my friends does use duckduckgo. I don't judge them for that since I've been pretty bad with privacy. I do worry if we get into more activism that we will need to secure our privacy

I'm personally trapped on Discord and Instagram.

Discord is required by my workplace, so no way of getting rid of it until everyone decides to move to something better. I have some friends on it too, but most of them also made Matrix accounts when I explained I won't be very reachable on Discord (I only open it when necessary; and it doesn'r run on my phone since they rewrote the app in JS). I have Instagram as a way to people I meet during travel or events to "add me" easily, and then we can figure out a good way to communicate afterward. I'm not too bothered by having it as I don't use it daily or anything.

Totally get you. It's why I roll my eyes anytime someone say "Be the change you want to see" as if I wasn't trying to and also getting a burntout from doing so. Easier said than done.

Sadly, people are simply just so comfortable with whatever massaging & social media app they used that trying out other alternatives is immediately dismissed as a inconvenient before they even tried it. And also we are so used to corporation taking so many of our data that some are just numbed about it and see it as a losing battle or they don't know how much valuable their information is which you often get the infamous "I got nothing to hide" BS.

I have got few my friends to use Signal when I was about to delete my Instagram. Still in contact with them which is a small victory for me.

Honestly, when or if eu chat control happens I'll just delete all of those applications and never tell anyone, I am not gonna use sms either

Yeah well imagine what it is when you are old yourself… having a majority of like aged friends and even older family… no one is ever leaving FB before they are ded :-/

Yes, I understand. The annoying thing is that you end up with two or more apps for the same purpose. Mid-term, I think the only way to go is to go cold turkey at some moment, but it will costs you some friends and family contacts.

Because lot of people just either don't care, are too lazy to switch, or the vast majority of their friends and family still use the apps.

In addition, they may feel like they are losing out on something, especially for Instagram where a large portion of the population uses regularly.

The crux is that all the alternatives suck. I don't have a problem going App hopping, I just have a very hard time finding ones that don't fundamentally suck, and I am not talking about little implementation issue, but garbage like Signal that violates the GDPR, wants your phone number and is proud of it. Always grinds my gears when that gets celebrated as the "alternative". Same with the Fediverse, where user owns nothing and server operator controls everything, how again is that different from Reddit, Facebook and Co.?

Nostr and Tox seem ok so far, but really the amount of true alternatives that improve on the original in significant ways is pretty damn rare.