One other simple thing, yet often overlooked by scammers, is the fact that the ANN threads of scams are poorly designed. If it seems like any college student could make the thread and it does not even contain proper images or marketing material, it is also most likely a scam.
Yes, one another simple thing that can be one of indication. I found something like that often.
The only person who would fall for a scam mining software is a greedy one who thinks he can make more money with that software and is fooled by it.
One in thousand miners may fall into that kind scamming scheme, and it may refer to the greedy one miner that you said, lol.