Real use case for this is so Google can poke into context for links shared via services they have no ownership.
They got used to know exactly what people share and, much more importantly, what people click on email, thanks to gmail rewriting all links to a google track url (while misleading the user by a fake status text on mouse over). When they sum the info of 1. who send it, 2. who clicked on it, 3. what was the email context, they can further classify the page content. (for ads, search ranking, whatever they do today)
But they can't do that on whatsapp, facebook, etc. With this "feature", now they have at least a modicum of context when the page impression show up on their Google Analytics trackers. Did you visit that wikipedia page because of recent news events, or doing homework?
Or, we could just go with occam's razor and believe that a bunch of bored engineers at google decided to simply add a feature completely disconnected from any of their business plans, and spent a few months tweaking a git repo with nothing but a README file... while the actual code review has follow up questions that were left open and merged anyway: https://chromium-review.googlesource.com/c/chromium/src/+/14... ¯\_(ツ)_/¯