Well, imho, scam is not necessarily take away your money. If you give something (your time, your personal data, anything, your signature) because you are promised to be rewarded, but in the end the person/entity is breaking their promise, it might be called scam/fraud.
And BTW when you give your data freely they might sell it to some people, and many people willing to pay for personal data.
That's right, providing the information you are not supposed to or being trick to steal your details is also a scam. However, if these hackers get your email address, they can start sending you, malicious links which if you are not careful and click them can lead you to be scammed. Be aware.