Recent examples: Google tracking users per Chrome installation ID [1], Chrome exempting Google sites from user site data setting [2], Chrome experimenting with silently proxying user traffic through their servers [3].
[1] https://news.ycombinator.com/item?id=22236106 [2] https://news.ycombinator.com/item?id=24817304 [3] https://news.ycombinator.com/item?id=25337995