This is more a personal, emotional qualm, though, like a phobia or a bigotry - but in this case, against people getting for free what you've paid for. Assessed rationally, that situation doesn't cost you anything - you'd have bought it anyway, their actions don't cost you extra. It has no direct impact on you, just a psychological impact on your pride and your values. It's hard to say whether this is their fault or yours; really, I think, it's something you have to get over, even though they are doing something wrong. Your indignation isn't the reason we punish them; we punish them because what they do is illegal. So you may as well find a way to put those feelings aside - they're inconsequential and in the end just make you angrier and less happy.