I started out one time filling out one of them ads, then stopped after abt 6 forms later. They keep you filling out them are you interested in: ads. And unless you "sign" up for one, or buy something, they just keep it going. I used a disposable email address, and in less than a month, I was averaging, 1400 emails a week just from that one curious trial.......
Use your own judgement, nothing is "FREE" in the world of business any more.
Bill