I'm interested in trying this out and started to go through the login flow for youtube, for some reason it opens in a tab within the Grayjay app which then means I can't use Google's passkey auth, and something is even preventing me from copy/pasting my Google password in from my password manager (it's too long for me to want to type out just to try the app.)
Gentle feedback to open the auth flow in the default browser, might make things easier.