I’m not zealous about it… I’m selling my privacy for 1.5% cashback to banks and for 5% to Amazon! However, I’m consolidating my banking to fewer banks than earlier. And I stopped using services that aggregate financial accounts to provide insights - budgeting, projections, investment advice, etc.

On the other hand I use Privacy.com for smaller vendors, but more often for security reasons than privacy. Monero for some services, like VPN.

Also, no real name or address in store loyalty programs.

Always carry extra cash everyday to pay at stores, never have debit/credit card in wallet unless it’s to withdraw more cash, never give stores your number or name to buy or reurn something, do not give legitimate info to register for a free store card, never register for a tap pay service on cellphone, buy a pre-paid credit card if you can buy it anonymously with cash, for Americans, use privacy.com for card masking.

If you exclusively use physical cash with change at stores and never give a name, there’s no behaviour prediction to get from you or how to advertise to you. Online purchases are not as good for data mining and tracking because there’s no geo location like paying with a card at a store that can be used to track your movements and at what time you were there.