It's no mystery. The game has zero challenge or depth, it is MMO homogenized to the extreme ends of casual and beyond.
Everyone leveled to 50 quickly and easily and then had very little left to do and everyone is pretty much rewarded for showing up. It's like they wanted to make everything so accessible that everyone got their fill quickly and left, the game had nothing left to offer.
Difficulty in games extends their lifespan and ultimately makes them memorable and - occasionally - legendary.
Easy games get thrown in the $5 bin or go f2p.