For those questioning (rightly) the "self-hosted" description, I suspect its a poorly-worded attempt to clarify there is no third-party requirement (eg. the repo is not cloudflare-owned) beyond your own cloudflare account.

Sometimes these "open source" services are a bit misleading as there is a coupling to the org providing them; I think the OP here just means there's nothing extra needed beyond whatever cloudflare commitment you already have.