The biggest scams are those "free trials" where you have to register your CC. don't care where they claim your details are safe with them (what do you expect them to say? 'we do not guarantee that your card details are safe)?the worst are those they opt you into "annual subscription" where you can unsubscribe anytime. just a scam they are hoping that you never remember to unsub, some are so unscrupulous that you don't even know youare annually subscribed until the details appear in you statements. i never give my cc details online fr anything