Re: Excluding old-fashioned human-vs-human games
Any human-v-human game where some think cheating is ok, whereas the others do not is probably not going to match the definition of "fun" very well for the non-cheating players.
Anyone who likes game cheating is IMO welcome to do so in contexts where that behaviour is an expected feature. If that's what you like, go for it, I don't care. I can sort of see the "backstabbing-the-backstabbers" attraction, even if it's not particularly for me.
But instead, if a "cheating is fun" attitude is based on (unfairly) screwing over players trying to play an honest by-the-rules game - what should we think of that?
Whatever the answer, I don't think it has much to do with whether it occurs in a traditional game or somewhere else.