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At least some organizations are legally required to archive certain information. I could imagine that there are certain obligations towards law enforcement to keep certain data and make it accessable upon court order.

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You might be thinking of "Know Your Customer" laws, which only apply to some industries and definitely not private persons for a blog. It applies to industries like financial, identification and certain types of commerce (eg: regulated products). Even then, only in some countries.

I don't know where you live but maybe just knowing of the concepts should be helpful. I think you should be totally fine to start a non-commercial website without consequence, but of course this isn't legal advice.

If you get a court order you have to hand over everything you have. But in most jurisdictions if "everything you have" is nothing there is nothing they can do about it.

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