The gov. should use public forms of communication, like their own websites and mailing lists. Why endorse this privitzation of their communcation channels in the first place?

If some service requires you to create an account, just give them false information. If they ban you, just create another account. At the end of day, the legalese is irrelevant. If it was relevant, then people would read it.

It is not like the user has any bargaining power with the platform owner to spy on them less for example, or even verify that they are upholding the privacy policy. These companies do not follow their own rules in banning you or otherwise.

However, the smug "write-only database meme" is getting a bit old. Cryptocurrencies, and even other crypto-payment systems (e.g. chaumian cash) obviously have different characteristics than centralized money. Come to think of it, you could just mockingly describe any computer program that has structured data as a database.

Cryptocurrency has almost nothing to do with databases or storing data. At its core, cryptocurrency is a system of distributing signed transactions that uses hashcash as a sybil-resistance and (order) synchronisation mechanism.

Google spreadsheets need not apply. The whole point is that you don't require a single party to sign transactions. The problem that cryptocurrency deals with concerns co-operation between adversarial parties. Centralization leaves you hopping from platform to platform forever.

You comment about cryptocurrency backed chaumian cash, there is already a project for this aimed at increasing the efficiency and privacy of bitcoin spends: https://fedimint.org/

The technical differences are too many for me to enumerate here. They are completely different technologies that make different efficiency-privacy-decentralization tradeoffs.

Functionally, Taler (and other forms of chaumian cash) are payment systems and not currencies. It requires a bank to implement it, in this sense it is less de-centralized, but likely much more efficient as there is no need for network consensus (because it depends on a central entity's blind signatures, etc. anyway). It has different (possibly better) privacy charichteristics than monero. They are both free and open source projects.