Check out the FAQ: #349
Couldn't find it
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You mean you couldn't find the FAQ (it's in the footer) or the explanation in the FAQ?
Explanation is here:
To make this feature sybil resistant, SN now takes 10% of zaps and re-distributes them to the SN community as part of the daily rewards.
the links in the Table of Content are currently broken but was fixed here, will be deployed soon