But people bet at box matches. Also, in some countries you can predict the score of a football match as a bet. They're both completely legal.
More, since she is a racehorse herself, she's likely placing bets on her own friends/rivals/etc here. Even if- or rather, especially if- she gets a big payout, that's going to make things awkward if they find out.
Feel like this warrants a Hilarious in Hindsight entry because the bottle of booze in the side is Nanakanba, a sake brand whose owners have ties to the RL Symbolis (and the namesake is indeed Rudolf), and didn't let the opportunity slide.
