You did not click the link because the very first paragraph addresses your question:
"For example, we may use generalization to replace segments of all area codes or phone numbers with the same sequence of numbers."
I hope you examine why you would ask a question, when you wasnt willing to read engage with the other side points. I guess Google must want your data to do something truly evil....which is to sell ads?
Everyone should decide for themselves wether a free service which uses your data to sell targeted ads is a fair trade. I just wish people would be honest about the risks vs rewards and honestly engage on what the trade off is, and not a paranoid version of it.
Well, consider some of the information Google is collecting:
Contacts
User Content (videos, audio files, photos, etc)
Identifiers (user ID, Device ID)
Usage Data
Financial information (payment info)
Precise location
Diagnostic data (crash reports, etc)
"Other" (WTH that means...)
Seems to me Google is looking for an awful lot of data to simply be selling targeted ads. And yes, they do more than just sell ads. For instance, Alphabet (Google's owner...) is involved in healthcare, private equity, venture capital, urban modeling, R&D, AI, etc, as well as other smaller ventures like Nest (which I used to use until Google took over and decided to "upgrade" the thermostat/smoke detectors without my approval), YouTube (which has a track history of demonetizing all kinds of content providers), home automation (via smart speakers that listen and archive everything being said even without the trigger word), etc.
Honest question: why would Google want to know such comprehensive and exact information (like my address) for the mere purpose of selling an ad? They are collecting more than coarse location data, for instance.
On the other hand, Apple has proven bona fides to me. In a highly public situation where the FBI flat out DEMANDED that they break into a terrorist's iPhone, Apple...couldn't do it. And if DDG is in the same mindset, I'm comfortable with them.