I want to know how many people visited my website. So does every website. It's something that websites need to know. We use Analytics to handle that for us, and because of this silly EU rule we're all technically breaking the law by not bothering every single visitor with annoying popups.
Now there are in fact bad companies collecting data on individual people, correlating it between sites on the backend, and using it for nefarious purposes. Those are presumably the reason these stupid laws were passed in the first place, and it would be nice if they actually did need to show a button for you to click.
But since the law says that everybody needs to show that button or lose the ability to know how many people saw their site, you never know whether you're getting the button for an evil site or just one of the millions of other sites you visit every day.
I don't blame the evil companies even a little bit for this mess. It's the people who passed these terribly thought out laws. They'll keep passing more of them until we stop letting them.