so they can give you better search results tailored to you
That depends on whether or not you agree with Google's definition of "better". What is better for Google is a set of results that make you most likely to click on an advert. Failing that, they want you to click a link, see the site, and either click an ad there or quickly return to Google where you'll click on an ad. The worst outcome for Google is that you'll click a non-paid search result, like it, and stay on that website.
This is the fundamental problem with search engines - if they work well and give you exactly what you're searching for first time then they won't make any money. A lot of what Google does is subtly trying to give you results that look great but really aren't.
That depends on whether or not you agree with Google's definition of "better". What is better for Google is a set of results that make you most likely to click on an advert. Failing that, they want you to click a link, see the site, and either click an ad there or quickly return to Google where you'll click on an ad. The worst outcome for Google is that you'll click a non-paid search result, like it, and stay on that website.
This is the fundamental problem with search engines - if they work well and give you exactly what you're searching for first time then they won't make any money. A lot of what Google does is subtly trying to give you results that look great but really aren't.