IMHO in this respect we already have built 'what we collectively want', however, the limiting factor is a lack of will to use or prefer privacy-preserving solut

IMHO in this respect we already have built 'what we collectively want', however, the limiting factor is a lack of will to use or prefer privacy-preserving solutions. The society has voted with its attention and wallets, and it doesn't want what the tech people think is good for society. You can't build a technical solution to a social problem - well, you can, but it won't get used and so it won't solve anything.