Of course there is. It's quite simple - if a user account is creating problem, put that account in read-only and give the user a few months to export his data a

Of course there is. It's quite simple - if a user account is creating problem, put that account in read-only and give the user a few months to export his data and move on. Thus the account cannot continue to cause harm, and yet any innocent victim suffer an inconvenience of migration, not a disaster of total loss.