Just in case anyone wonders what happened to multi.tube, I thought I should post this final shutdown notice.
Further to previous explanation, I can no longer justify spending money and time to keep this site running as it has never received much traffic or created any revenue. Hopefully , or somebody else, will be able to resurrect it in the future in a more permissive jurisdiction than the UK, or somebody will have time to build a mechanism for handling take-down requests.
Again, the site is based on an open source project, which you can find here on GitHub.