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But I don’t use those services; they still keep my data.
Exactly why we need data privacy laws. Sadly there are “profiles” out there for all of us, whether you chose to be tracked or not. Personally I think that any kind of sharing of personal data with marketers should be illegal nor should it be legal for any entity to purchase personal data without a signed consent form from the person in question.
That’d probably end “free” services and our credit score system in the United States but honestly that kind of data collection is equivalent to stalking and unethical.
If you self-host all the same services you have the same exposure level if root on your hosting machine is compromised. I suppose it depends on how confident you feel in how agile you can patch if a vulnerability becomes known in postfix for example. I wouldn’t consider self hosting something that reduces your cybersecurity risk typically