Say for instance, I found a lottery ticket on the ground, would it be haram if I used it? Because right now, I'm using a rewards website that gives me surveys to fill, and rewards me points which I can redeem for cash, and there is this sweepstakes that’s going on and if you spend some points, then they will place you as an entry. Is this haram, even if I’m not losing a single penny?
Briefly speaking, generally, the response would be yeah if this sort of lottery is counted as a kind of the gambling. Then, it is a haram act even though you don’t lose anything. Of course this matter could be surveyed from different aspects, but as a significant one, let’s see why Qomar or gambling is called Myser (میسر) too?
It is called like that since somebody (one side) obtains the money or the property of another one easily. Accordingly, as a reason, it is haram even though you don’t lose anything. (Since somebody else will lose his/her money easily and actually without any remarkable attempt. Besides, it is declared that playing with gambling instruments would be haram as well, even you don’t win or lose, since totally Qomar is haram based on Quran and narrations.
References: (As 2 Shi'i (Shia) sites)