Unless you are hundreds of years old, or actually living in a cave and off the grid, life never was private.
In most countries, people are required to have an ID, like Social Security number in the USA.
From that alone the government has your ID number, name, and usually an address and contact information.
This info is often shared in many places, like banks, credit card companies, places of employment, etc.
If you work for a company, as most people do, chances are you applied at many places before you got this last job.
Each company gets lots of information about you, checks your info, credit, criminal background, references and past history, even if you don't get the job.
Then most people live in some type of dwelling. You have to give lots of your information to them, even if you buy the property.
Like most people, you probably get service of utilities like electricity. They want your information also.
Unless you like staring at the walls most people have some sort of tv service, like cable or satellite. They want your info.
Same is true for Internet service, and most any other type of service. They all want and usually get your info.
When you pay your expenses, unless you use only cash, you tell these service business where you store your money, and your financial companies which services you buy. The secrets are out!
If you don't choose to be a hermit, you might choose to make friends, buy groceries, visit places, and they want your info too.
So of all the millions or possibly billions of people these companies like Google have information on, with billions of bits of information, why is YOUR information so special or interesting that it even matters if you store your contacts or emails with them or on your local phone or some computers and servers???
Your life was never private, and unless you really want to remove yourself from any sort of life, it never will be. Privacy is a facade. Only tiny bits of your information can be kept secret. Even account numbers and passwords have to be stored on these companies servers just so you can login.
Using many of the conveniences of life, they can make life easier, simpler or both. Technology is a big part that. To give up so much versatility to hide so little information that is stored with only those companies that provide the services, just like all the other services you already use, seems too high a price to pay just for some pretend privacy.