Some people just don't have the choice. My university class group depends on Messenger, several family members and friends do too. It may be easier to incite individual people to change messaging services, but when it comes to groups or common social connections, it becomes quite difficult. I can't ask everyone in a group to stop using Messenger just because I don't want to, and neither can I ask my family to contact me solely on Telegram or Signal if other family members refuse to switch. Having everything at the same place is so convenient for most people that it's nearly impossible to provoke this kind of change.

You don't ask everyone. You try to build momentum. Get the nerds, geeks, and people that like to feel like they are special for using tech. You get these people because the privacy features. They are the easy grabs. Then one by one you form groups with those people and a few outsiders. You get these people because there's no meaningful usability difference between apps. At some point you have critical mass and getting others is fairly trivial. "We're all talking over here, just come on. It is easier." You get these people because of network effect.

You can't expect everyone to switch all at once. If you really want to get people on the app you have to be smarter about how you get people there.

You always have a choice. Belief that you don’t is the falsehood. If someone needs to communicate with you or you need with them, there are many ways.

The world functioned fine before Messenger.

Pick up a phone, or for that matter talk to people in person. It’s not rocket science.

> You always have a choice.

I agree with this statement. It's always a matter of priorities and perceived cost vs profit.

In any case, I never said it was going to work the same for everybody.

I have simply given my personal anecdote of how I used to believe that there would be a high social cost associated with closing those accounts, and in the end I found the opposite to be true.

I know of many other such anecdotes, but I also know of a few rare ones where the cost was too big and they decided to reopen said accounts.

As always, YMMV - but please don't spread the idea that it will be costly for everybody. It might just be that people feel better and find other ways to communicate, or it may be that they decide to rejoin such services.