If the user has a free SourceTree license associated with their email address, when they try to delete their Atlassian account associated with the same email adress, hey will be presented with the message : "You can't delete your account
Your account can't be deleted because:
- This account is the primary billing contact for one or more products.
- This account is a technical contact for one or more products."
Our team is currently working on addressing this issue and we will update this public issue as soon as this is deployed.