Probably can't even reach the ending due to bugs, or they might have just read about the endings online and decided not to continue playingFrom all the users on steam only 30% just have talked to Hanako at the Ember, so the majority of the steam users don't have played any end mission. Maybe that's why the this topic doesn't get much attention, yet. They simply don't know.
Considering the game lost 79% of its player base already, that means that at least 50% of players have no intention to see the endings, despite how short the game is