Nothing will ever beat the Taimanin RPG gem debt fiasco. Complete and utter idiocy on the JP devs of that game.
For those unaware:
The devs released the game like 2+ years after the JP version. The JP version has relatively low gem (the premium currency for gacha and shit) income and costs for things. They wanted to essentially inflate the global version so that 100 gems (in JP) became 1000 gems (in Global), so that they could give 5-10 gems here and there for events/quests and it'd actually be the buying power of .5 -1 gems. But the math genius involved didn't take all income sources into consideration.
So every time you pulled a character, even the R's, you could grind out their affection and it gave you some gems. Well the devs accidentally gave global a buff on the amount of gems you get from it, instead of reducing it to match JP's income level, without inflation taken into account. Plus, the devs put in an affection boost buff for the entire launch period (2 weeks). So literally the whole playerbase spent the first few weeks grinding every character they got, rolled more characters, grinded those out and had a huge surplus of premium currency. This was well documented on social media for the game.
So how did the JP devs handle this? They put every player into gem debt (negative amount) for all of the gems you had after they adjusted inflation. So if you had grinded 100,000 gems, and the new "proper" amount you should have received would have been 1000 gems, you went into debt of -99,000. You couldn't roll or buy stamina or anything until you hit the positive. Not only that, since they "fixed" inflation, now you were getting like 250 f2p gems a week. Utterly decimated their game and they never walked it back and went EoS a few months later. Literally one of the stupidest things I've ever seen a company do.
Then Tribe Nine and their idiotic decisions. It's a curse or something.