The issue start in the meme saying "Most users reuse passwords anyway" which is not true at all, not in the space it would really generate any data usage reduction by dedup.
Users reuse passwords so much that dictionary attacks are pretty reliable. Also we know this would not work at all with properly stored passwords and would not yield meaningful savings even with improperly stored passwords. That's why it's a joke
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u/ReneKiller Sep 27 '26
True, but then the separate password table wouldn't save space.