No longer doable, at least in Europe, you can't buy per-paid phone card without showing you government ID. And I believe you will not be able to create Twitter (that is, X) or Facebook account without being forced to provide something more than email. I've tried, and account was immediately lock until I provide more credentials (gov id or phone number).

All of this is to fight child porn, as always, although, unlike normal people, those who earn on child porn can make that additional effort to find some homeless person, drug addict, etc. and get sim card activated.

So we are where we are with lack of privacy for regular people. Maybe one day governments will realize that not only them have access to all of this information, foreign intelligence too, which make much easier to recruit/blackmail spies and in the end, shattered privacy costs much more than imaginary child porn fight.