No, but it doesn't entitle you to any protection either.
And it its extremely legal for Paypal to take money from your account. In essence, when you add a bank account to your Paypal account, it's collatoral. By doing this, you guarantee that even if Paypal has to go into your bank acoount all of your buying and selling expenses will be paid. It's Paypal and Ebay's way of knwoing that if you happen to owe money and have none in your Paypal account, they will still get what they are owed because they can remove it irectly from your bank account. It's as legal as a loan company needing collateral for a home or car loan. In essence it works exactly the same way.