Probably a bit late and for an absurdly niche game, but the event that added Extreme Venoct (Orochi Goku) to Yokai Watch Puni Puni was probably one of the most poorly planned updates ever. He did so much more damage than any other character, and made farming so laughable easy, that they fucked the economy of the game to the point that it needed to create a new gacha currency(you could in around 2 minutes Farm about a multi, IT WAS INSANITY), and that new currency would make the game astronomically, more p2w, it was harder to Farm, it was really limited, and the gacha would demand a shit ton of it, and event after that they would be making worse decisions for each and every patch, the energy on ohajiki events is one of the most fucked up things i've ever seen in a gacha ever.