They're fair points for platforms for distribution of products like Itch.io and Steam, but they don't apply here at all! You made a fantastic project and shared it with the world on a platform meant to share source code . This is now an artifact that countless others can use to spin off their own cool ideas and let their own creativity take form.

If someone uses this and expects maintenance, I'd say that's just entitlement on their part. Github is the perfect place for cool ideas like this even if it ends up being throwaway, and its a gift to the world that you shared it openly.