No it hasn't happened - yet!
It does sound like a marketing scam and one that we should be aware of too. What kind of information is requested at point of subscription? Your home address? Payment details? Or is it just your e-mail address (and those of your friends and family) that they are interested in? If the latter then it sounds like a great way to get active addresses for a spam shot.
I could be wrong, and it may be a perfectly legitimate site with the best of intentions so if anyone conected with them is reading this then please feel free to let us know.