Most of the world's adult population, even those who do not use the Internet or social networks frequently, have one or more Google accounts. The widespread use of Google accounts began with the launch of the free Gmail service in 2004.
Google needs this information to personalize its services for us, and also to show us relevant advertisements, but there is no obligation for us to provide it. All tracking services can be turned off, it simply means that the user experience will be cumbersome, because then we will have to watch advertisements and search results that do not match our preferences.