Which of these major tech companies famously began as a completely different business before pivoting to their current well-known product or service?

Product development isn't always a straight path to success. Some of today's most successful companies underwent dramatic pivots that completely transformed their business models and products. This trivia challenges you to identify one of the most famous product pivots in tech history that fundamentally altered both a company's trajectory and an entire industry.

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Slack - Originally developed as an internal communication tool for a failed gaming company called Tiny Speck
Amazon - Originally designed as a peer-to-peer book exchange platform before pivoting to e-commerce
Uber - Originally launched as a helicopter booking service called UberChopper before focusing on car rides
Netflix - Originally created as a movie production studio before pivoting to DVD rentals and streaming