The big one is it makes it more attractive to your friends. There is no way to turn off Messenger if you have an fb account, so your friends will tend to message you there, and the more friends they have easily accessible in one place, the more likely they are to a) sign up, and b) stay accessible there, which perpetuates the cycle.
You have to delete the accounts so your friends can't reach you on the surveillance/censorship platforms! Otherwise they will use them and continue to use them.
You have to delete the accounts so your friends can't reach you on the surveillance/censorship platforms! Otherwise they will use them and continue to use them.