No dev anywhere manipulates rng against the player.
I want you to sit quietly and think about why a dev would ever do that? What benefit do they get from doing so? What are the alternatives to doing this? Then I want you to consider the negatives that might occur from doing so. Now, using logic and keeping in mind the goal is to sell games, come to a conclusion.
Dunno about manipulating RNG against the player, but plenty of devs everywhere do manipulate the gameplay in the AI's favor. Just look at any strategy game in existence where the AI just ignores penalties the players has to put up with lol. In the case of BG3, even if it's not RNG, it is most certainly manipulated in favor of my dreaded arch nemesis: the Gnolls.
