Which dictionary product launch was nicknamed 'Dictionary Day' and caused traditional publishers to lose significant market share within a year of its release?

In the world of language and linguistics, dictionaries are essential tools for language learners and enthusiasts alike. But behind these scholarly tomes lies a competitive industry with strategic product launches, marketing campaigns, and business decisions. This trivia question tests your knowledge about one of the most famous and controversial product launches in dictionary history - a move that dramatically changed how we access language resources today.

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Oxford English Dictionary's first online subscription service (1995)
Merriam-Webster's free online dictionary portal (1996)
Collins COBUILD English Language Dictionary mobile app (2001)
Cambridge Dictionary's integrated translation platform (1999)