That's not what /r/niceguys means. /r/niceguys is to ridicule people who expect to be guaranteed sex after being 'nice' and getting their good boy points, with no actual nice intentions. Real nice guys do get the girl.
However, women are usually more attracted to alphas, who can be far more violent, aggressive or dominant. Women regularly invite those guys in despite the risks because tingles. Otherwise a lot more nice or average guys would be getting laid. /r/niceguys
-no sources The only ways relationships can end is breakup or death. As lesbian relationships are only now not taboo, there aren't many old lesbians to die.
One time I played Pokemon Showdown with a female avatar and my opponent was like 'I can't beat a girl' and "I really really like you" (after one battle) Thirst is real.