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The unpredictability of not knowing what you'll get next, is exciting, and allows the user to imagine all the many things that it could be.
That moment of 'opening' your reward becomes addictive.
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This theory was popularised by Nir Eyal, in his book Hooked.
It explains why the TikTok feed is so addictive—because you never know what the next scroll will show you.
"The next video might be really good".

It turns TikTok into a variable-reward slot machine.
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Feature usage
Habits
After a Headspace meditation, you’ll be shown a motivational quote underneath your streak stats.

Refind incentivizes user referrals by giving coins and offering to buy them back later at a mystery value.
