I'm the admin for Jira and Confluence in my company. In the past few months, I've gotten at least a dozen email warnings that someone has created a new instance of Confluence 'outside of our domain.'
In 20 years of dealing with Atlassian products, this has never happened before. Did something change, making it much easier for inexperienced users to inadvertently set up a new instance? Every time this happens I have to contact the user and cancel the subscription - it's a PITA.