The anime horse girl who's terrorizing gacha players in Umamusume is based on a real, chaotic racing horse who once instantly obliterated 12 billion yen in betting losses

https://www.pcgamer.com/games/sim/the-anime-horse-girl-whos-terrorizing-gacha-players-in-umamusume-is-based-on-a-real-chaotic-racing-horse-who-once-instantly-obliterated-12-billion-yen-in-betting-losses/