Don't need to buy the game.

Make a JP Nintendo account and download the demo (not available globally) https://store-jp.nintendo.com/item/software/D70010000010547

Almost every console jailbreak required the use of a specific game, going all the way back to the original Xbox. PS1 and 2 required a specific disc or swapping in a legit disc. Even the NES required a real game cart alongside your third party carts.

It turns out that opening locks is a hell of a lot easier when you have a key.

I remember having to buy GTA Liberty City Stories to jailbreak the PSP. Then there was the infamous Cubic Ninja jailbreak which caused the game to become worth hundreds of dollars.

Console hacking has been like that for a very long time. But usually after the first exploits are found and hackers can start playing with things, many more follow. Though Nintendo has been stripping down the OS every new console so there’s less interesting stuff to exploit outside of games.

This gives visibility to a lot more unencrypted code, so just give it time. More bugs will be found quickly now that the code is inspectable.