> Do not join "loyalty" programs, do not sign up to surveillance platforms like Facebook, do not submit your DNA to DNA databases, pay in cash whenever possible

> Do not join "loyalty" programs, do not sign up to surveillance platforms like Facebook, do not submit your DNA to DNA databases, pay in cash whenever possible, etc. I'm doing most of that already but even if you do all of these things, there's still the "friends" problem. The friends who use one of those apps that upload all of their contacts to the central server. The friends who use facebook. The family members who submit DNA to DNA databases. Very likely your friends are similar to you, so they serve as good predictors for your own data. As is for your family members, they usually have very similar DNA to yours :). E.g. if your friends all live in one certain city, then you likely are to live there as well. If you have a suspiciously high amount of medical doctors in your friend circle, you are most likely one yourself. If 50% of your contacts are LGBT community members, you are likely to be one, too. The data hoarders of this world don't need you to submit your data yourself in order to have your data.