However, if they are themselves scammers (e.g. refuse to pay out jackpots or anything to that effect), then cheating on them can be morally justified (as I see it)
Yep, something I had in my mind for discussion too at a later point. Like does scamming a scammer make you a scammer yourself ? From the general answers so far in this thread, I would assume that most users would be ok with doing it and you are no scammer per se, more like a modern Robin Hood maybe. But then again, a lot of users showed high moral standards (which is good) and even scamming a scammer is not easy to square with your conscience. You either have it kind of in your DNA or not imo and feel bad for doing it yourself, no matter the circumstances. Technically it will be hard anyway, since they are pro with scamming most of the times and you are not
I see your point
You basically say that to scam a scammer still requires you to be a scammer deep down inside ("to have it in your DNA") even if it can be justified on some moral high ground. However, if it is a good thing in its own right and serves a good end, you might try to reframe it. For example,
disobeying an unlawful order:
Not only should an unlawful order not be obeyed, obeying such an order can result in criminal prosecution. Military courts have long held that military members are accountable for their actions even while following orders
The trick "I was only following orders" doesn't work out in most cases. And we can draw some parallels here, i.e. not scamming a scammer when you can pull it off can be reframed as being involved in the scam