No, only users registered on an instance can create communities. They can moderate remote communities though.
Meta
Discussion about the aussie.zone instance itself
I'm not entirely sure of the answer, but you can definitely have multiple accounts on different instances to get around any limitations.
No, but you can (and probably should) have accounts on more than 1 instance
Why?
I'll take a guess.
Defederation issues. Instance failing.
Example: beehaw defederated from the 2 big instances. Lodion, if we use aussie.zone as an example, wasn't 100% sure of aussie.zone's future.
Without account migration available like Mastodon has, having more than one account allows the full experience.
Edit: and the point of this thread, creating communities can be limited.
Exactly.
And Jerboa has multi-account support for other readers.
I also read that you can set up multiple PWA on your phone for each instance if that's required.