If we want to track how cohorts evolve over time then we should just track that in a secure manner; or not track it at all if we can't do it right. It just seems like a simpler approach than finding some other more "fuzzy" metric to use as a proxy.
The question is if it's really necessary to track 'cohorts' per se? With the security risk and disfavored UX it entails. If you can get a decent enough statistic from other more aggregate means.
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If we want to track how cohorts evolve over time then we should just track that in a secure manner; or not track it at all if we can't do it right. It just seems like a simpler approach than finding some other more "fuzzy" metric to use as a proxy.
The question is if it's really necessary to track 'cohorts' per se? With the security risk and disfavored UX it entails. If you can get a decent enough statistic from other more aggregate means.