yt-subscribe is a small, private tool for a single household. It keeps a self-hosted RSS reader in step with our own YouTube subscriptions, so we can see every new upload from the channels we follow, in order, without a recommendation algorithm.
It is not a public service: there are no accounts to create and no one else can use it. With our permission, it reads the list of channels our YouTube account subscribes to (read-only), and nothing else.