Answer:
Marketing tatics to draw customers in is a very common practice of non reputable online casinos and unscrouplous casino portal sites who promote their casinos through spam emails.
The leading web site against this type of practice and who have a gained a respected position in tackling these issues head on is casinomeister.com. Check out their list of rogue casinos.
Another point to make is all bonus/free money is restricted to a wagering Claus. This 'free' money is also only valid for certain games in the casino.