There are many cases where Google has used dark patterns to gather data from users. Now, the ToS may mention those cases clearly, but that's not an excuse for the Google's behavior.

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