Which gaming company first popularized the 'daily rewards' system that gives players increasing incentives to log in consecutive days, now a staple in free-to-play games?

In the competitive world of gaming, companies use sophisticated psychological techniques to keep players engaged and loyal. One particularly effective strategy has been mastered by certain companies to create 'sticky' experiences that keep players coming back day after day. This poll tests your knowledge of which major gaming company pioneered a particularly influential engagement technique that has since been widely adopted across the industry.

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Zynga (with FarmVille in 2009)
Blizzard Entertainment (with World of Warcraft in 2004)
Epic Games (with Fortnite in 2017)
Supercell (with Clash of Clans in 2012)