I think this is something similar to survivor bias? If you don't know what it means it's like making armor for people who survive a war, thinking that the damages in their armor were the parts where it should be more protected due to damages but in fact, it only showed that because dead people don't bring their armor back. Same thing here imo, kind of, you don't exactly identify every wins/losses that affect the big picture, you just identify ones that are relevant to you. It's biased. If this was house edge then yea, we've always been cheated by casinos but that goes for every business to be fair. But in scenarios like this? Unless a comprehensive research is done, I can only cause this a biased view.