> (a) normalising people uploading identification documents

You might not know it or think too often about it, but most "real life" services we use require online identification, at least in Europe. Even on a simple rental agency portal in Germany it's recommended to "verify" your online identity to get more chances. Which means: just do it. Sure, you're free not to do it, as landlords are free not to care about your application at all.

Do you want to renew your car papers? E-ID is there (or whatever existing alternative).

Bank? The same.

In Germany the government[s] are pushing for Digitalization since years, which many laugh at as "ahah, what a joke, it's just filling an online module and sending a fax". It was true 5 years ago. Now I was super surprised because I recently had to do some bureaucratic BS and it's like any "normal" internet service that would require an identification (which is not just via a credit card or so). It's still not 100% accurate or "frictionless" but they're seriously getting there, which is super hard in a country where govt office A won't share data with govt office B. Compared to standing 1 hour in line to get just a stamp on a paper this is light years ahead.

The same will happen to these platforms, because that's the only solution we can think of, as of today. We all stand and watch Facebook making profits off our kids, making them depressed, etc. If you fine them, you're a communist, if you block them, you're a Nazi.

This is the most balanced alternative: you can still run your business here, people can still use social media, but let's not fuck up anymore our new generations, children, teenagers. They are the grownups of tomorrow.

Also, as some other comments mentioned elsewhere on HN: assume your data is already stolen or "publicly" available (maybe hidden somewhere).