Not everyone playing these games is a both A) a man B) who self inserts hard into the male MC.
For me who are neither, few, to not say 'none', genres play female lust so wonderfully like netorare. The betrayed male lead for me is a narrative device and nothing else, I love corrupted female characters which is one of the few instances I can enjoy a sex visual novel, or regular novel, to the extent of fantasizing going through what those girls go.
Perhaps for you netorare is simply 'cucking' but that's just both a male centric view and also wrong one. First of all, a cuck enjoys a woman fucking other people and that's the end of this kink. A majority of the audience of this genre, at least in Japan, is females because it tends to corruption, cheating, or rape fantasies, or even better, all of them at the same time.