When I try to delete my account, it tells me I'm a technical contact on a subscription. On the license management page, there is one free "subscription" for a Bitbucket workspace I deleted.
I do not see this mysterious "cancel subscription" button the documentation speaks of, only a useless "Archive" button. The support form is so utterly terrible I can't even ask an employee to delete this subscription for me. So now I'm hoping to find somebody here 
edit: After the incredible hurdles to open a support ticket (which a bot marked as resolved anyway and I had to manually un-resolve to get a human to look at it), I'm definitely going to avoid Atlassian for the foreseeable future. They do not care about their customers at all.