one purpose is webtracking, especially in the affiliatemarketing niche, which "suffers" from cookie deletion because the cookiebased-tracking then does not reco

one purpose is webtracking, especially in the affiliatemarketing niche, which "suffers" from cookie deletion because the cookiebased-tracking then does not recognize visitors and thus affiliates don't get paid... fingerprint methods are another alternative, although less precise and more difficult to implement.