Its very easy, also the same for all communication. You move and if your friends want to keep contact to you, they will at least use both. Otherwise they never were your friends, unfortunately. Friends dont abandon friends that are not happy in one place. Most likely, people will THINK it is the reason they cant leave. But its actually just an excuse because they are scared or lazy or insecure. All understandable but you dont get to claim you stay because your friends do.

Once they grasp the idea, some will move. Just get off of these shitty apps and see the excuse for the pile of shit that it is.