From your response OP, looks like this question is better suited for r/privacy
Besides simple utility and session tracking, the real answer is that absolutely every sizeable website benefits from tracking as much user data as possible. The reason? Advertising. The more they know about your browsing, clicking, and exploring habits, the better they can crunch huge volumes of data to identify patterns in consumer interest and spending. Either they use this data themselves, or they sell it to third parties.
In a nutshell, companies benefit from tracking you, there is little to no regulation on how much they can track you (GDPR was a bandaid on a compound fracture), and companies will continue to track you as much as they feasibly can. There’s the reason the popups are designed to be annoying, with the easiest way to dismiss them being “Allow all”.
Bonus – if you don’t explicitly disable third-party cookies (browser settings), sites will even install cookies from their affiliates and earn a small commission for the data they harvest from you.
Google has some of the most invasive cookies, which makes Google Ads one of the most bang for buck advertising services. Amazon uses to show you more stuff you’ll buy. Same with FB/Insta, and Tiktok on mobile has perfected the art of using even the length of time you hover before scrolling in their recommendation.
If you’re interested, check out this concept/book called Surveillance Capitalism that explains how pervasive this is – https://en.wikipedia.org/wiki/Surveillance_capitalism
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