My biggest annoyance with cookies is that I want to block Google Analytics cookies, but at the same time I need to log in to analytics to manage some customer sites. As far as I can tell, this is the same cookie (in fact, it can be the same cookie in all google services).
I really don't trust the Google cookie. They were apparently one of the first large companies to set a cookie expiration date to 2038 (maximum), and their business model is almost entirely based on advertising (targeted advertising). I suspect that they know more about everyday online activities and the interests of people than any other government or organization on the planet.
Not to say that all this is evil or something else, but in fact there is a lot of trust to get one essence. They may claim that they are all anonymous, but I am sure that the claim will be difficult to verify. In any case, there is no guarantee that this data will not be stolen, legally acquired or otherwise used for some future purposes for other purposes.
It is possible that one day such profiling can be used to orient people to more serious things than to advertising. How difficult it would be for some future Hitler to establish IP addresses, bank accounts, schools, employers, club memberships, etc. Any arbitrary class for imprisonment or worse?
So, I reply that this is not a small problem, and history has taught us many times what can happen when you begin to classify and track people. Cookies are not the only means, but they are certainly part of the problem, and I recommend blocking them and clearing them at every convenient opportunity.
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