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Reward Loops
Entry #0603
Why the app that pays out randomly is the one you reopen
Two apps deliver the same amount of good news. The one that spaces it unpredictably is the one whose icon your thumb finds without a reason.
Novice
The hidden part
#0603
Regularity tells you when to check. Randomness tells you never to stop. Retention is built from the second, not the first.