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There might be good money in finding email addresses. https://hunter.io/pricing https://hunter.io/pricing has a model of 25 free searches, then paying. Personal

• symonda 3y ago
  Interesting example. This type of information is hard to find so the revenue model definitely makes sense. For many other types of search, the data collection isn't the hard part, instead the difficulty is to make sense of the unstructured data that isn't very hard to collect. That is why I think paid search is difficult to motivate to an end customer.