because the truth is most real-world strategic interactions involve some amount of hidden information. So, when it comes to these games, poker has served as the primary benchmark challenge going back decades. In fact, if you look at the original papers on game theory, pretty much the only application they talk about is poker, because it's so accurately, it captures the challenge of hidden information. Particularly, there's a variant of poker called heads-up no-limit Texas hold'em that has emerged as the primary benchmark for these games.