Way before I'd ever found Kong I'd tried a couple on Facebook and they were equally as bad as the average one here. In my limited experience, it's something endemic to the genre and platform, independent of Kong. I even looked into how to make one way back when and the overall template is the same (and for sale). For a cool, idk, $600, you could buy the template for those basic going-on-"missions"-uses-energy with timers game. Whether it was a Harry Potter rip off, a sci-fi adventure, or a car racing game, the template was exactly the same.
Like evilsnow said, they're so prevalent because they're profitable. Nobody played the Jaguar game system. It tanked. Everyone played the SNES. It flew into the history books. Those MMOs are the height of casual gaming, which is all anyone has time for these days.