This would be great and all, but all parties who are in a position to choose to implement this kind of system or to keep the status quo are already motivated to keep (and expand) the existing systems, for any number of reasons. Everybody (except the end users) loves to keep that juicy metadata and incidental logs of everything.
It's worth designing a system of government that works for everybody, if only for the simple reason that we will very shortly (if we don't already) have a system that works for nobody, and likely everybody shooting everybody else will follow soon after that. A utopia at least gives people something to shoot for, and if you get very lucky you might end up with an idealist in power who's willing to give it a shot.
(Repost from 2021: <https://news.ycombinator.com/item?id=26560821>)