Eh, because people are tired of supporting a game then learn that it a favorite fetish of the dev and the game they love then turns to shit when that dev starts making that unwanted fetish into a priority. Hell the dev could even render all the women in the game having sex with everyone except the MC first, and then just say 'it's a bad end and not canon so don't worry about it'. It's a fairly common thing for dev's to do when they are sneaky shits. lol
Many dev's just need to grow a pair of testicles/ovaries (depending on their pronoun, lol) and the couage to go with them and say flat out, YES or NO at the start of the game if the story will include that. Either a dev has the story planned ion their head/drafts already or they are just making shit up as they go along.
Those with a true vision will know 100% if a fetish will be in the game, so when a dev basically says "maybe" that means:
1) They have zero vision for the actual story (which some might have a problem with and usually means the game is a clusterfuck with inconsistent updates anyway)
or
2) They DO plan to add it but want to milk enough folks before they drop the true story that all those people leaving when stuff is suprise included, won't cause a major financial drain. Most dev's who do this also hope the game will then have new supporters who will overlook shit they might not actually like, for the other stuff they do.
TL;DR Dev's need to just put the shit out there that they WILL or are strongly thinking they WILL include in the game and let the cards fall as they may with their game fans.