Imagine paying for storage and not use all of it.

feddit.au would not make sense, last time I checked Australia is not a german speaking countr. lemmy.de was one of the proposed new domains, iirc, but the users eventually chose feddit.org specifically because we did want to make it a clear successor to feddit.de, but we didn’t want to tie it to a country specific tld like .de, .at, or ch to indicate that none of the german speaking countries is “more important” or “prioritized” over the other.