Be aware, It's 100% SCAM.
There is no way to double your bitcoin in 3 hours without any services or any deals.
Maybe the first 10 times will pay, and next, they scam.
I don belive this type of program is still around.This type of program is mostly active when Liberty Reverse is running.But come on,its 2016 already.Just like you said,maybe they will pay us a several of time,but don think this type of program will last long.