Another one, when a resource is available in multiple places, like Gopher, HTTP and Gemini (and IPFS, why not?), are there going to be N registries?
Wild idea, how about using the HTTP response codes https://developer.mozilla.org/en-US/docs/Web/HTTP/Status or from Gemini https://gemini.circumlunar.space/docs/specification.gmi
Like 308/31 for redirections, 410/52 for Gone and such