I fully agree with you kharvell.

It is the moral obligation of the user to inform all "clients" that he / she no longer represent that company. This is the only clause his ex-employer can present as a valid reason for lost bussines - the ex-employee used (abused) the company credentials for his own purpose after (or perhaps even during) his employment. The rest is free will and no obligation to none of the parties.

It is similar to persistently using the company domain e-mail - after you leave the firm, just because it was not canceled by IT / HR in a timely manner.

Somthing like that!