Yup. There's no limit to the number of collections you can make. If the service is useful for people, I can create optional user accounts for easier management

Yup. There's no limit to the number of collections you can make. If the service is useful for people, I can create optional user accounts for easier management, but for now, just don't forget your password. Or make the password easy, because what's the incentive for people to even try to get control of someone else's list?