I feel like what you mean by "digital ID" is very different to what others mean.
Here's a marketing page for a WIP pan-EU project to implement this kind of digital ID: https://commission.europa.eu/topics/digital-economy-and-soci...
There are also various plans for age-verification schemes that should (partially) preserve anonymity, but those aren't implemented and it's not what people mean by "digital ID".
> "Legal" protections can disappear in one evening, and then you are left with a centralized system, very practical for population control.
but none of the upsides.
Once the eID system is set up and becomes ubiquitous, it will be trivial for companies to use eID to open any online account or reserve plane/train tickets. Therefore, giving enforcement forces very convenient access to all of my activity and allowing automated monitoring. Just look at what is happening in China.
https://www.theguardian.com/world/2019/mar/01/china-bans-23m...
Why would a porn site pay ten cents per visitor to get a legally binding id of its visitors? But even more importantly, why would anyone sign it?
Y'all seem to think digital ID is some kind of super-cookie that tracks your every move online.
It's not.