I loathe cookies.
https://support.google.com/blogger/answer/6253244?p=eu_cookies_notice&hl=en&rd=1. There is a possibility that the same notice is visible on the blog. (I run a Firefox script that eliminates these notices, so even if present, I wouldn't see it.)
If you use Firefox, my recommendation is that you install the Self Destructing Cookies extension. Then adjust the parameters so that cookies are deleted on sight.
The only viable option in preventing super-cookies from being installed, is to uninstall all software provided by known purveyors of malware, and not re-install them under any circumstances.
Oh, In brief, Google's policy is to track everything it can, regardless of legality, because they can do so. Its former motto "Do No Evil" was merely a PR stunt that proudly proclaimed that they not only were capable of doing evil, but they took pride in so doing.