Any data that is aggregated is open to abuse by the aggregator and it will be definitely abused if the aggregator is a government body.
Norway is one step closer to that:
https://www.lifeinnorway.net/norway-to-track-all-supermarket...
Even in your contrived dystopia, I'd rather have a democratic government be the Big Brother than some unelected tech CEO.
When somebody says "This may be controversial // Well, much better than being crushed under a rock", the latter is supposed to be rhetoric, here somebody seems to treat it like a real alternative, as if you went into the current events to avoid that!
I trust the former more to have my best interests in mind.