Late post I know, I was away on holiday, sue me 🙂
AWS announced Dec 18, 2019 that Cloud9 was now available in 6 more regions, Sydney being one of them!
Announcement post here: https://aws.amazon.com/about-aws/whats-new/2019/12/aws-cloud9-available-6-more-regions/
This will make life easier as the process for building Cloud9 was not pleasant behind a proxy 🙂
Team at work is already using this one so great to see this in Sydney now.