The only accounts that are cancelled without several warnings first are blatant spammers or duplicate accounts. Everyone else receives at least 2-3 warnings, sometimes more. In the case of duplicate accounts, we cancel the duplicate immediately and warn the original account to not create duplicates again.
People often say they had no warning and they don't know why they were cancelled, but that's never the way things happen.
I'm an admin at another site: the more explanations you give, the more trouble and work you get. Thus an admin will probably not start a discussion with someone he wants to block. (Off site or on site)
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