这篇文章的第一条评论写得很不错:现在的免费线上服务,比起传统的纸介质的报纸、杂志,省却了分发渠道的费用(比如印刷、投递),所以免费。但广告还是要的,卖用户数据也是自“古”有之。
The "free" model could also be called the "marginal cost of distribution" model and it's been with us for a long time.
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