In my case, unofficial communication channel for college/school/job. You can handle it just with offical email and classes or phone but since everyone is on 1 a

In my case, unofficial communication channel for college/school/job. You can handle it just with offical email and classes or phone but since everyone is on 1 app and basically no one on any other you loose out anything which is not necessary but not helpful. And goodluck convincing a non tech boss or several profs to switch. This is kinda the issue with network effects.