Fraud or other illegal activity. Negative balance. Not following bank policy. No activity for an extended amount of time.

Accounts can also be closed at the discretion of the manager--like, if you're unforgivably rude or difficult, the manager can close your account.

For having a negative amount for 1+ years

Not using your account at all

Overdrafting. Suspicion of fraud. Abandoned account.

Not following the terms and conditions of the account.