We all know the reason.
When the game was in its early days, it's pretty obvious that DreamNow developped both Roxy & Natalie with a clear "ménage à trois" playable route. With both the sisters being pretty nymphomaniac, we could expect lots of interactions including "lezzy sisters" and I'm certain such a route would have gathered a huge fanbase.
Unfortunately, at some point DreamNow realized that this lezzy sisters plot put the game on the risk to be canceled from its current platform (Patreon) and / or rejected from new potential platforms like Steam. Since he was able to earn nice and well deserved money already with UoP, he choosed to sacrifice this route not to threaten the whole game, replacing Roxy by Mallory for some piece of threeway action with Natalie, and switching Natalie by Nikki as main LI.
I regret this choice, but I perfectly understand it and I'm still there waiting for updates because the game is good enough even without one of its most exciting potential routes.
I am not that indulgent with the BasketBall thing, something he developped then abandoned because... he certainly poorly planned this as a game creator. But hey, that's its first game. That kind of mistake happens too.