Maybe it's her mandatory penance for the Flaggot situation? Could even be that DM she thought was a joke, but Sakana really did mean it when he said she had to play League.
Doubt it would ever happen. League requires far too much focus and dedication with matches easily running 30 minutes or more, which would make it hard for her to interact with chat and other things, so she'd probably drop it sooner than later. At least if it's a collab you're communicating with the person you're playing which makes it less dead air.
Well at least they'll have all the skill and success of Team Siren.
> "Losing is not an option!"
> Proceeds to lose every single match played.