The Chrome experience is actually part of a new standard, Federated Credential Management (or FedCM for short). The idea is to create a browser mediated login experience that gives the identity provider and web app what they need without being able to correlate requests across the Internet. I am working on an article on this topic. If you are interested in learning more, here's a video from a recent auth focused conf…
I mean, that doesn't sound privacy-preserving at all?