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A comment on In Germany, the use of cash has become a proxy for concerns about trust, privacy. Parent comment

Re:In Germany, the use of cash has become a proxy for concer... by blacksmith_tb on Friday May 25, 2018 @02:07PM (#17156378)
Another popular approach is to exchange loyalty cards occasionally with friends (or strangers!), to scramble the usage data.
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Re:In Germany, the use of cash has become a proxy for concer... by ryan-c on Friday May 25, 2018 @04:26PM (#17157613)
I've done that too. Throw them all in a hat and redistribute them randomly once every couple of months.
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