During the haydays of WhatsApp updating their privacy terms, there was a month long battle where people kept saying how everyone will quit. The reality is, most people just don’t care about these things if their network is highly entrenched in one app. What happens is, some communities “partially move” the sensitive stuff to like Signal and others.
Honestly, all of these are documented probabilities at this point. SNS owners can do very decent predictions on what will happen if they introduce certain kind of friction. Also, it’s not 2005 anymore, people are used to upload their IDs everywhere. I mentioned it before as well, if you’ve used any large app, the chances are you’ve uploaded your ID (AirBnB, Tinder, and etc.)