Before signing up. I suggest you read the terms & service. This is a company that gathers email addresses. Then it provides those addresses to subscribers of their service.
Go ahead & sell your email address for 20 views. By this time tomorrow. You will be deleting 100 emails from companies trying to sell you something.
Oh yea. In order to stop receiving emails. You must unsubscribe personally to each and everyone of the companies, that send you an offer.