I don't understand the motivation of the person who sees 60 hours of video uploaded to YouTube per second, 30+ new video games released on Steam per day, 100,00

I don't understand the motivation of the person who sees 60 hours of video uploaded to YouTube per second, 30+ new video games released on Steam per day, 100,000 songs uploaded to Spotify every day and 6,000 Tweets being made per second, and decides "You know what the World needs? A way of enabling more people to make more content faster."