You can't. The account information is required for audit purposes.
If you contact sales at atlassian dot com, they can delete an account if you've never had a licence, but if you have, then they are required to keep a record of it.
You can (and should, if you don't need it), change the email to a dead email (email@example.com something), then change the password to a random string and simply forget you ever had it...
So can you explain how it is insane to give people a way to easily breach their contracts with a supplier, launder money and commit fraud?
Think it through and learn, and don't be a troll with a throw-away account.
And Atlassian don't sell user details to people.
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