I don't know what to tell you. For me, every update has been building up to this, from the elf slave story slowly progressing with more elf colonies you find out about, some that enslaved others. Android's glitching revealing mysterious entities in cyberspace, and the storyline of society's increased use of robots and AI to perform tasks the elves are currently performing, making their existence more precarious. This story doesn't seem like the type to just kill or imprison all the elves as the endgame, so a revolution is the only solution.
Plus, remember the breeding of elf clones for their blood? This was revealed 2 or 3 updates ago, and couldn't just stand unremarked. I am only a little surprised Kali and most of the others seem overall OK with it.
I think most of us players weren't at all surprised by the turn toward darkness. Sorry you missed it. Maybe you should read more books. Other than the fluffiest young adult novels, the good ones have layers of story that aren't immediately apparent from the first chapters.
It's true that there is a major change in theme from the happy Harem Hotel, to the world being taken over by an AI overlord, but for me when the Hotel was invaded by the cops, I knew the shit was about to hit the fan in a big way, and nobody would be unscathed. It is basically a heavily foreshadowed plot twist, that for me just makes the story more interesting.
After a handful of updates introducing and getting to know the main characters, all AVNs need some propulsive mystery or plot element to keep the story fresh update to update. Just having everyone happy and the MC playing musical hotel rooms with all the LIs for the next 10 updates would be rather boring, wouldn't it?