Theory: all user-generated content sites inevitably have ads on them.
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Replying to @yishan
A sole-publisher content site can decide unilaterally never to accept advertising, and pursue other revenue sources instead.
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Replying to @yishan
But any site that gains enough reach to be relevant becomes valuable to advertisers. On UGC sites, one of the following things then happens:
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Replying to @yishan
3) advertisers independently contact regular users and pay them to broadcast their message for them ("spam").
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Replying to @yishan
#3 is inevitable if #1 does not exist because not all users are as scrupulous as site owners, and anti-spam enforcement is never 100%.
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