For all of history, there has been a Public. That is, somewhere other than the privacy of your modern bathroom.
In the olden days, bath rooms were public, too.
And they fought in them.
When in Rome...
As long as a person sets foot outside their door, they are exposing themselves to a lack of "privacy".
What this means is that what Privacy means in this context is not the same thing as keeping something Private.
Privacy in the online world is mitigating the amount of data that is available about you that can be exploited, used for Target Market Advertising and that is used to shield you into a personal bubble of confined world-view.
And there is quite a lot that you can do to mitigate that. You cannot cut it all out entirely.... Just as you cannot stop your face being seen, what clothing you chose to wear when you walk out the door. The observers on the downtown bus may know what you look like, but they may not know whether you like sushi or pizza unless you specifically tell them.
Google - GMAIL analyzes the content of user emails. Protonmail - does not.
In this example, choosing to use Protonmail over Gmail offers a layer of protection against untoward exploitable observation of personal details.
Add another layer by using UnGoogled-Chromium.
Use an alternate phone OS than Android or Apple. So on an so on. While a person will not utterly and totally remove all the spying, they can reduce to a very tolerable level.
None of the above is the same as a person wearing a tin-foil hat and believing that there are conspiracies out to get them. It is all about the money.
Many companies realized that they could emulate the path taken years ago by Radio. Put out a product for Free to listeners (Since there was no practical way of billing individuals for listening to the radio) and make your money by selling advertising time.
Now, Games, phone apps and all the rest have taken that concept to a whole new level. Downloadable content, pay to win, It is all based on exploiting every last facet of human nature to squeeze every last nickle and dime out of the consumer.
Exploiting personal data to sell to advertisers to use to boost their effectiveness and sales is just more of the same.
It's not a conspiracy, it is just greed.
And greed works both ways.
Privacy, once invaded, then became Marketable. Now, it is a selling point to offer a product that protects privacy. Look at Brave Browser. And how much do you pay for Brave, by the way...? How do they make money....
In this example, we can see our own responsibility in this and one more than we can do to take privacy back. Society needs to stop demanding or expecting "Free" products with Good Results.