Earlier quoted context omitted.
After you clear to the linked bank account, you need to be sure to move the money into a second account, as they are permitted by the terms of service to attempt to withdraw from your linked bank account any and all money they deem necessary up to the total amount received for all transactions for a good deal of time. I strongly advise you link a non-primary account for this reason.
Wouldn't they just attempt to withdraw it from a now empty bank account, leaving you with overdraft fees? EG let's say you have $100 in your paypal account, which you send to bank account A. From there, you send it to bank account B, leaving bank account A empty. Paypal decides to withdraw $100 from bank account A, leaving you with -$100 on A, and $100 on B?
I should know - I do this for customers at my bank every day. I'm not sure, however, whether this would also stop Paypal paying money into the account. I'm fairly certain not, but I've never had to stop someone paying money into an account before...