ClassifiedSweepstakes 50$ no deposit bonus - legal in the US?

I just received an email with 50$ no deposit bonus from this site:

Classifiedsweepstakes (dot) com

Even more - they say it's completely legal for US players to gamble there... Did anyone hear from them before?
Anyone else played there yet?

Could be legal - but could also be a scam to get credit card details. From my experience, if things seem too good to be true they often are... but each to their own. Best of luck.