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Internet-oriented companies that have a large number of users and possess detailed personal information on them, presumably without their consent.
Definition source: English Wiktionary via Wiktextract
Usage: derogatory, plural, plural-only
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Borrowed from German Datenkraken, plural of Datenkrake, itself a compound of Daten (“data”) and Krake (“octopus”), invoking an imagery of such a company being an octopus having its virtual "tentacles" deeply penetrating its users' online habits.