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Oh shoot - I missed this comment. There is a sign-up form on the home page: https://multiverse.plus/ Just under the image of the PC.

Ok, this worked. Really enjoy the site so far. I expect to be a medium+ term visitor.

Feature recommendation (that you didn't ask for): Allow users to embed blocks on their own sites.

You can do this! If you look at the source code for the landing page, there is a way to embed a post and specify a size for it as well.