Here is another example of how PayPal is a bit shady:

Sign into PayPal to send money. If you have a credit card as a payment method and a bank account as a payment method, PayPal will auto select your bank account. That's fine, except when you change your payment method from the default bank account to your credit card. A confirmation page comes up and tries to change your selection back to your bank account. There are two options: Use Bank Account / Use Credit Card. These options are randomly changed back and forth to confuse the user. Even the highlighting of these to option (which one is yellow) is randomized to make you accidently select the Bank Account option.