Obviously, that's the whole purpose of it. Track what you like, and show you more of it. And this is not a problem, as long as it's handled with care, and not

Obviously, that's the whole purpose of it. Track what you like, and show you more of it. And this is not a problem, as long as it's handled with care, and not leaked or abused. It doesn't even matter who might be accessing the data, be it China, USA, the Church, your eternal enemy, whatever... It's crucial data, which can be weaponized against people depending on the political situation. And people should be aware of this and should have a strong interest in implementing strong laws for protecting those data and being linked to their identity.