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The answer is mentioned hidden in the article: to detect accounts that scrape/resell the data found in LinkedIn profiles.

• jacquesm 7y ago
  Unfortunately for linkedin spying on all your users in order to catch a few miscreants is not how you implement stuff like this.
  • driverdan 7y ago
    Of course it is, it's SOP. CAPTCHAs, for example, are much more intrusive but are used everywhere to catch a minority of bad actors.
    • jacquesm 7y ago
      But CAPTCHAs do not fingerprint all your users, contrary to legislation in quite a few countries. Fingerprinting is illegal in the EU.
      • driverdan 7y ago
        ReCAPTCHA fingerprints users to determine a risk level.