Ryujinx don't works on android. So also not on the Odin 2 Pro as an example. that's why (for me).
did you try annas-archive? maybe you find your books there. i always did buy from amazon and then removed the drm and stored it offline on my pc so amazon can't take them away.
why? because it feels safer to join a big and longer lasting instance than a random one with almost no users. such small instances can vanish from one day to the bext. i once created a account on such a small instance and not even a week later it was wiped from earth, taking my account with it. so it's no wonder people chooser rather bigger instances.
"sue-you". Suyu. it's a clever wordplay. i love it.
i heard that's already in development, so it probably will come sooner or later