When Epic Games launched Fortnite in 2017, what unique product launch strategy did they use that contributed significantly to its massive success?

Epic Games' Fortnite became one of the most successful video games of all time, revolutionizing both the battle royale genre and free-to-play monetization strategies. Its innovative product launch and continuous evolution have become a case study in gaming industry strategy. Test your knowledge about how this gaming juggernaut was initially introduced to the market!

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They released it as a free-to-play Battle Royale mode after their initial 'Save the World' paid version, quickly responding to the popularity of PUBG
They launched with a $100 million esports tournament prize pool announcement on day one, attracting professional gamers immediately
They debuted with exclusive PlayStation console access for the first six months before expanding to other platforms
They initially released only on mobile platforms to capture the casual gaming audience before expanding to console and PC