Maybe they use something like https://getemails.com/ ? It works only for emails but basically the same scenario. Source: almost 2 years ago
I haven't had exposure to this space since the GDPR went into effect, but it used to be trivially easy to do this. A quick Googling shows there are still providers of this sort of service, such as GetEmails[1] which bills itself as '100% compliant in the US'. [1] https://getemails.com/. - Source: Hacker News / almost 3 years ago
Do you know an article comparing GetEmails to other products?
Suggest a link to a post with product alternatives.
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