Hey buddy,
Speaking from my own experience, it's very hard and easy tasks pay very little/hour. At first, it was earning descent amount of money per hour($0.5/hour) but after a few days of using, the earning/hour went down drastically to just $0.12/hour. Now, I have to give credit to Picoworkers for this since it's still better than most other legit money making sites I used and that's why I still use it. A few cents per hour is worth it for me when I'm bored and there's no good tasks in those other sites I'm using.
So in short, the tasks that pay great are very hard and those that are easy-normal level pay very little but since it's better than most of the other sites from my perspective, i still use it.
That's all, thanks for read.
Have a great day...