I think you’re connecting digital IDs with people’s online activity for some reason. In most countries, authorities can already connect online activity with an individual, since you register and pay for internet. Doing things that the powers that be don’t like will get you in legal trouble. Remember the 2000s when the music industry sued individuals for millions? In China they take down your post if it challenges social cohesion, in the USA they take all of your money and assets for challenging corporate revenue.
Most digital IDs are options for people that already have their bank/credit card on their phone and don’t want to carry a wallet just for ID. Some places like Estonia go further with actual asymmetric keys that let you sign documents with your ID’s private key that proves you signed it.
I don’t understand. Police can track you down via your credit card, your phone, your licence plate on your car, rando security cameras. All of these are hard to avoid. How often does your ID not just get checked, but recorded? It seems like not much of a game changer.