Which product development innovation first allowed free-to-play games to become financially viable at scale in the Western gaming market?

The gaming industry has transformed dramatically over the years, especially in how games generate revenue. The traditional one-time purchase model has evolved into complex virtual economies with various monetization strategies. This poll tests your knowledge about a pivotal product development shift that changed how games make money and engage players. Do you know which innovation truly revolutionized the gaming business model?

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Microtransactions for cosmetic items (skins, character customizations)
Subscription-based access to game libraries (like early Xbox Game Pass)
Ad-supported gameplay with video advertisements between levels
Physical merchandise tie-ins with digital game content