Google Search is notably absent in your list.

If this proposal becomes standard in Chrome, You can be sure Microsoft and Apple will follow Google's lead with the same or their own similar implementations.

See Microsoft Pluton and Apple's Private Access Tokens. Or read this article which provides an excellent overview of these developments. https://news.ycombinator.com/item?id=32282305

Make no mistake. If this becomes standard on Chrome, this is going to be standard on the web.